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The Submarine Technology of Jules Verne

 

http://www.navy.mil/navydata/cno/n87/usw/issue_21/verne.htm

 by Edward C. Whitman

As an inspiration to the submarine pioneers of the late 19th and early 20th centuries, no other literary figure loomed as large as Jules Verne, the “father of science-fiction” and the author in 1870 of Twenty Thousand Leagues Under the Sea. American submarine inventor Simon Lake, for example, credited his life-long interest in undersea exploration to having read Verne’s novel as a boy – and in 1898, he was thrilled to receive a telegram of congratulations from the author himself when his own Argonaut completed its first substantial ocean-going voyage. Educated as a lawyer, Verne lacked formal training in science and engineering, but nonetheless chose so shrewdly from the speculative technologies of his day in creating a futuristic submarine for his protagonist, Captain Nemo, that the essentials of his undersea vision – examined here – have nearly all been realized.

 

 

Nemo’s Submarine Precursors

Although very early submarine experimenters such as Cornelius van Drebbel in early 17th-century London and David Bushnell in the American Revolution had demonstrated occasional successes, it was only in the early and mid-19th century that the problems of underwater navigation were attacked in earnest. In France, for instance, the American Robert Fulton – later renowned as the “inventor” of the steamboat – attempted to win the support of the government of First Consul Napoleon Bonaparte for an undersea craft capable of breaking the British blockade. Awarded a contract for building a man-powered submersible of his own design, Fulton christened his boat Nautilus – the same name chosen by Jules Verne 70 years later – and successfully demonstrated it on the Seine in 1800 and later at Le Havre. Napoleon soon lost interest in Fulton’s initiative, but subsequently, he supported the evaluation of a less-expensive wooden submersible built at Le Havre by two brothers named Coessin. Their prototype achieved some limited success, but then nothing more was heard of it.

In the 1830s and 1840s, several other French inventors – DeMontgery, Petit, Villeroi, and Payerne – offered other submersible concepts, and some were actually built. But it was only when the French Navy became interested in a design by Captain Simon Bourgeois and naval constructor Charles Brun that significant progress was made. In 1863, Bourgeois and Brun launched Le Plongeur (“the Diver”) at Rochefort and experimented with the boat for three years. Powered by a reciprocating engine driven by stored compressed air, the 140-foot long Le Plongeur managed to average five knots submerged but suffered from inadequate longitudinal stability and was eventually abandoned. At the same time, other European countries were pursuing their own submarine programs, and on the far side of the Atlantic, the American Civil War had stimulated more immediate interest in submersible combatants, particularly in the Confederacy, where raising the Union economic blockade was a primary objective. There, the most spectacular success was achieved by the hand-cranked submersible CSS Hunley, which in February 1864 sank the USS Housatonic in Charleston Harbor – the first-ever sinking of a warship by a submarine. In light of his voracious reading and exhaustive reportage of the Civil War by the European press, Jules Verne would certainly have known of these events at the time he embarked on writing Twenty Thousand Leagues Under the Sea.

For the submarine community, Twenty Thousand Leagues Under the Sea raises fascinating questions: Just how prophetic was Verne in exploiting technologies nascent in 1870 to create Captain Nemo’s Nautilus? How accurately did he predict the actual evolution of the modern submarine? And how many of the undersea innovations he envisioned 130 years ago have actually been realized?

 

Designing and Building Nautilus

According to Verne’s tale, Captain Nemo and his men built Nautilus on a desert island in total secrecy by ordering components and materials from disparate sources and arranging their delivery to a variety of covert addresses. The design was entirely Nemo’s, based on the engineering knowledge he had gained from extensive study in London, Paris, and New York during an earlier part of his life. The steel double hull is spindle-shaped and 70 meters (230 feet) long, with a maximum diameter of 8 meters (just over 26 feet). As Captain Nemo describes it,

…Nautilus has two hulls, one interior, one exterior, and they are joined by iron T-bars, which gives the boat a terrific rigidity. Because of this cellular arrangement, it has the resistance of a solid block. The plating can’t yield; it’s self-adhering and not dependent on rivets; and the homogeneity of its construction, due to the perfect union of the materials involved, permits it to defy the most violent of seas.4

Submerged, the submarine displaces 1,507 metric tons (roughly 1,670 short tons) and surfaced, with only one-tenth of the hull above the water, it displaces 1,356 metric tons (1,495 short tons) – Verne is quite precise about this.5

Nautilus is controlled from a small, retractable pilothouse set into the top of the hull about a quarter of the way back from the bow. Several large bi-convex glass windows – 21 centimeters thick at the center – provide an all-around view, augmented by illumination from a separate electric searchlight mounted in an external pod abaft the pilothouse. There is no periscope – these would not come into general use for more than three decades. For use while surfaced, a small, flat deck fitted with removable manropes is apparently installed just behind the pilothouse, and this can be accessed by a hatch from below. Nemo and his first mate frequently use this platform for celestial navigation in conjunction with a pit log read out by electrical telemetry. The only other protuberance topside is a low “dry-deck shelter” faired into the hull for housing a metal dinghy that can be entered and launched from within, even while underwater.

Electricity – A “Powerful Agent”

With its imaginative technology, Nemo’s engineering plant for Nautilus is certainly the most extraordinary aspect of his design. On behalf of his nautical protagonist, Verne conceived what was essentially an “all-electric” ship at a time when the first practical applications of electricity were only a few decades old and a century before building any such ships became feasible. In Captain Nemo’s oft-quoted words,

There is a powerful agent, obedient, rapid, facile, which can be put to any use and reigns supreme on board my ship. It does everything. It illuminates our ship, it warms us, it is the soul of our mechanical apparatus. This agent is – electricity.

 

And indeed, Nautilus uses electricity for cooking, lighting, distilling fresh water, running pumps and other auxiliaries, instrumentation, and, of course, main propulsion. The ship is fitted with a conventional four-bladed propeller at the stern, six meters (20 feet) in diameter and coaxial with the centerline of the hull. Consistent with the relative diameters of the hull and propeller and the freeboard prescribed by Captain Nemo, Aronnax observes that when surfaced, the propeller blades occasionally rise above the waves, “beating the water with mathematical precision.” Verne has Nemo claiming a speed of 50 knots at 120 revolutions per second – probably in error. 120 revolutions per minute makes much more engineering sense for a propeller that size, particularly in view of the type of engine that powers the submarine.

 

Curiously, the main propulsion engine on Nautilus is not a rotating electric motor. English scientist Michael Faraday (1791-1867) had established the principle of the rotating motor by 1825, and an American blacksmith, Thomas Davenport, had patented a direct-current (DC) motor with all its essentials – rotating coils, a commutator, and brushes – in 1837. Yet, despite the fact that several motor-driven electric vehicles had been demonstrated in both Europe and America by mid-century, Verne’s notional design for the prime mover on Nautilus emerges as the electrical analog of a reciprocating steam engine, “where large electromagnets actuate a system of levers and gears that transmit the power to the propeller shaft.” In other words, the main engine seems to be mechanically equivalent to a steam engine with “large electromagnets” replacing conventional pistons – a choice that seems strangely backward-looking in light of Verne’s technical sophistication.

 

In contrast, the “breakthrough” that enables Nemo to generate virtually unlimited electrical power extrapolates electrical science so far into the future that only “the willing suspension of disbelief” keeps technically-astute readers onboard. Although some hasty writers have wrongly portrayed Nautilus as “nuclear-powered,” the actual source for her vast reserves of electricity is described as a hugely scaled-up elaboration of a well-known 19th-century primary battery, the Bunsen cell. Invented in 1841 by German physicist Robert Bunsen (1811-1899) – better known for devising the “Bunsen burner” – the Bunsen cell uses a carbon cathode in nitric acid and a zinc anode in dilute sulfuric acid, with a porous separator between the liquids. The device generates a potential of 1.89 volts, and later versions added potassium dichromate as a depolarizer.6 Let Captain Nemo describe his fundamental modification:

 

Mixed with mercury, sodium forms an amalgam that takes the place of zinc in Bunsen batteries. The mercury is never consumed, only the sodium is used up, and the sea resupplies me with that. Moreover, I can tell you, sodium batteries are more powerful. Their electric motive [sic] force is twice that of zinc batteries.

 

Had this actually been tried, the reaction of metallic sodium with sulfuric acid would have been exciting to behold.

 

Despite some ambiguity in Verne’s description, it also appears that the relatively low voltage of the Bunsen cells is stepped up to a more useful level using a double-wound variant of the induction (i.e., “spark”) coil invented in Paris by another German, Heinrich Ruhmkorff (1803-1877), around 1850.7 This same combination of a sodium-based Bunsen cell, probably some kind of periodic interrupter, and a Ruhmkorff coil is described later in the novel as a high-voltage power source for portable undersea lights. Ultimately, Nemo replenishes his sodium supply by distilling seawater and separating out its mineral components at a secret operating base located inside the crater of a volcanic island near the Canary Islands. The energy for this process is derived by burning sea coal, which he and his men mine from the ocean bottom.

 

 

Submerging, Surfacing, and Life Onboard

Similar to the approach adopted by subsequent submarine pioneers Simon Lake and Thorsten Nordenfeldt, the basic technique described for submerging Nautilus and maintaining a desired operating depth is to flood ballast tanks to establish net neutral buoyancy at the corresponding water density. The main ballast tanks are sized to bring the boat just under the surface when completely filled. For deeper submergence, additional water is introduced into supplementary tanks, which can increase the weight of the submarine by as much as 100 metric tons to match the increasing weight of its displacement with depth. As John Holland later established in his first successful submarine designs, a much more efficient depth-control technique is to establish slightly positive buoyancy and maintain depth using the dynamic forces generated by the boat’s forward speed. In fact, “with a view to saving [his] engines,” Captain Nemo also exploits dynamic forces, but only when he wants to take Nautilus below 2,000 meters. Then, two horizontal hydroplanes mounted at the center of flotation (that is, amidships) are used to angle the boat downward in response to the thrust of the propeller. Within a few decades of the appearance of Twenty Thousand Leagues Under the Sea, it had also been realized that stern planes are much more efficient for controlling depth dynamically, but Nautilus has no stern planes. In any event, Verne claims extreme depth capabilities for Nautilus – Aronnax reports reaching a depth of 16,000 meters (52,500 feet) in the South Atlantic – reflecting a time when it was not yet known that the world ocean reaches a maximum depth of nearly 36,000 feet in the Challenger Deep.

To regain the surface, the ballast tanks are emptied – not by compressed air, but rather by using powerful electric pumps, supposedly capable of working against even the highest back-pressure. Aronnax even describes what we would call today an “emergency surface blow”:

The Nautilus rose with terrific speed, like a balloon shooting into the sky. Vibrating sonorously, it knifed up through those waters. We could see nothing at all. In four minutes we traveled those four leagues between the bottom and the surface.8 After emerging into the air like a flying fish, the Nautilus fell back into the water, making it leap like a fountain to a prodigious height.

Although Nemo acknowledges that he has the scientific acumen to “manufacture” air for ventilating the submarine underwater, he opts instead to use electrically-driven compressors to store breathing air in special tanks, with periodic visits to the surface to replenish his supply. However, when Nautilus becomes wedged beneath an ice cap near the South Pole – another geographical misapprehension – this dependence on surface air puts the crew in extremis until they devise a clever way to free the boat by melting the surrounding ice – using electricity, of course.

Nemo’s crew are a strange, largely silent lot, and it’s never clear how many there are. The most Aronnax ever sees on deck at one time are about 20, but there are likely more below. However,
the crew’s berthing compartment on Nautilus is only 5 meters (16 feet) long, so unless the berths are stacked like cordwood – or there’s a lot of hot-bunking going on – it seems unlikely
that there could be more than 40. On the other hand, Captain Nemo’s quarters are quite lavish, consisting of a 5-meter bedroom, a 5-meter private dining room, a library of about the same size, and a 10-meter salon – 25 meters out of a total hull length of 70 meters. Moreover, the salon contains a priceless collection of European art, a small museum of unique biological specimens, and most famously, a pipe organ. Large observation windows, concealed by movable panels, are fitted into the outboard bulkheads, providing a close-up view of the passing underwater scene to both sides, illuminated as necessary by the external searchlight.

 

Captain Nemo as Scientist and Explorer

For underwater exploration, treasure-hunting, and gathering food from the ocean bottom, Captain Nemo has provided Nautilus with an integrated airlock and a suite of sophisticated diving equipment, which includes diving suits with a self-contained underwater breathing capability clearly recognizable in today’s SCUBA gear. Nemo credits the Rouquayrol-Denayrouze diving apparatus – a “demand-valve” system invented in France in 1864 – as the basis for his version, which uses back-packed tanks of highly-compressed air capable of sustaining underwater excursions ten hours long. For undersea illumination, spiral gas-discharge tubes – actually invented earlier in the century – are used as lanterns, with excitation by the high-voltage output of a portable version of the Bunsen-Ruhmkorff system described above.9 Outfitted in this way, Professor Aronnax, Conseil, and Ned Land join Nemo and his men for a series of vividly-depicted underwater expeditions, where they get to experience both the wonders and dangers of the deep.

Despite Nemo’s obsessive, vengeance-driven dark side, Verne credits him with unparalleled accomplishments as an underwater scientist and explorer. Among his many discoveries are the lost continent of Atlantis, a subterranean passage between the Red Sea and the Mediter-ranean (i.e., a subaqueous Suez Canal), countless new species of undersea life, and new findings in oceanography. He maps the ocean bottom, measures thermal profiles, and observes that in all the deeps of the world, the water temperature approaches the same limiting value of 4.5 degrees Centigrade. He skillfully conns Nautilus through the Strait of Gibraltar by taking advantage of the same deep-lying, outward-flowing current layer exploited by savvy submariners in two world wars decades later. In the wonderful world of Twenty Thousand Leagues, there is seemingly nothing that Captain Nemo cannot do.

 

The Undersea Legacy of Jules Verne

Accelerating progress in fielding undersea vehicles in the late 19th century – and rapid advances in both natural science and engineering technology – created the milieu within which Verne launched his “submarine novel.” For a non-specialist, Verne was unusually well-informed about recent progress in the science and technology of his times. Consequently, his reputation as a futurist rests not only on his imaginative predictions of things to come, but also on his uncanny skill in crafting convincing extrapolations of the technologies of his era to achieve those visions. Flying continental distances, journeying to the moon, penetrating to the center of the earth, exploring the depths of the ocean at will – all these had been thought of by other men. But it was Jules Verne who first popularized notional solutions to these challenges and created a sense of possibility that had been absent before.

So alive does Nemo become for us in Twenty Thousand Leagues Under the Sea that generations of readers have been tempted to credit him with creating Nautilus and stimulating our subsequent fascination with the undersea world. But it is really the broad erudition – and extraordinary imagination – of Jules Verne that illuminate these pages, much as Nemo’s Ruhmkorff lights illuminated the treasures of the deep. Verne died in 1905, just as the first generation of modern submarines reached fruition and less than a decade before they achieved their first lethal successes in undersea warfare. In foreseeing the possibilities inherent in the submarine 35 years before, he had been right about some things and wrong about others, but the likelihood of fulfilling all the essentials of his vision is now little doubted.

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Submarine LNG Tankers

Russia's Kara Sea may very well replace both the Gulf of Mexico and the North Sea as the world's primary source of gas reserves for the first half of the 21st century. Its giant gasfield Rusanovskaya is believed to hold gas reserves of 282 tcf and up to 4 billion bbl oil, and the Leningradskaya and Zapadno-Sharapovskaya Fields, just 30 and 80 miles south of Rusanovskaya, respectively, could both prove to be supergiants near or greater than Rusanovskaya, if current studies prove correct - certainly enough to supply Japan and China for the next 250 years.

Rusanovskaya, with a water depth of only 50 meters, and the related structures of the Kara Sea shelf are, however, icebound approximately ten months of the year and are only accessible with icebreakers. Several proposals have been made for exploiting these enormous reserves, but the usual configuration of arctic rigs and concrete platforms put forth by the Russians and occasional Western oil companies simply can't handle the Kara Sea ice. Furthermore, although Europe may be a market for the huge gas reserves of the Barents Sea to the west, Asia is a more likely market for those of the Kara Sea.

Faced with these daunting conditions, few operators have made overtures to the Russians for tapping the Kara Sea's resources until now. Recently, the American company Werner Offshore proposed a unique solution to the quandary - submarine production and a fleet of submarine LNG tankers.

 

Submarine Solution

Jules Verne foresaw the conduct of commerce beneath arctic ice back in 1870, with the publication of his remarkable adventure tale, Twenty-Thousand Leagues Under the Sea. In that classic science fiction novel, he told how the mighty Nautilus submarine commanded by the indomitable Captain Nemo, mined the ocean floor and plied the frigid polar waters at a depth of 3,000 ft beneath more than 4,000 ft of ice.

Only the US nuclear submarines Nautilus and Skate have since traversed the polar ice cap, in 1958, via the Northwest Passage from the Atlantic to the Pacific. During World War II, however, in the Battle of the Atlantic, German U-boats constantly patrolled the Atlantic to sink Allied ships, and to keep them constantly on duty, a fleet of submarine tankers carrying diesel fuel hid beneath the polar ice until needed, then sailed out to refuel the U-boats.

Dubbed "Milch Kuhs", or "Milk Cows", the U-boat tenders were actually modified U-boats themselves. They were built at the Deutsche Werke and Germaniawerft in Kiel, Germany, with a length of 67 meters and width of 9.35 meters. They each carried just over 200 tons of diesel fuel and a crew of about 60 men.

Herbert Werner, head of Werner Offshore, was a U-boat commander during World War II. To approach the problem of tapping the Kara Sea's gas resources and transporting them to market, he remembered the near-forgotten Milk Cows of the German Navy and adapted the idea of submarine tankers to meet the difficult conditions to be encountered. Once conceived, Werner took his ideas to the Russians and consequently signed a joint venture agreement to exploit the Rusanovskaya and Leningradskaya Fields.

Werner plans to build a fleet of 22 submarine tankers by the year 2013 at a new shipyard set to begin construction in Vladivostok in 1997, which will be jointly operated by Werner Offshore and its Russian partners. The tankers will be 1,300 ft long with a capacity of 170,000 cubic meters of LNG. They will be manned by a crew of 14 and powered with an air-independent, closed-cycle diesel system from CDSS of the UK.

Werner's production scheme consists of a fully automated, subsea production system - designed by Werner Offshore - which will produce the oil and gas, with the oil piped to conventional surface tankers for transport to Europe. The gas, however, will be piped to a gas liquefaction plant on the coast of Novaya Zemlya Island, where it is to be processed into LNG, then transferred to submerged submarine LNG tankers.

The plan is for Werner's submarine LNG tankers to carry the gas in an 11-day voyage under the polar ice across the Kara, Laptev, and East Siberian Seas of the frozen Arctic Ocean north of Russia to Alaska's St. Matthew Island, in the Pacific Ocean's Bering Sea. Once at St. Matthew, the LNG is to be transferred to conventional surface LNG tankers for further transport to Japan or China.

The first voyage of LNG under the arctic ice is expected to occur in May 2004. Werner Offshore predicts peak production will find the submarine fleet carrying more than 21 million tons of LNG a year

What Richard Branson hopes to find at the bottom of the sea

http://www.spiegel.de/international/business/private-submarines-gain-popularity-with-millionaires-a-819643.html

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Submarine Superyachting

 

7 October, 2012, Ft. Lauderdale: The Ft. Lauderdale International Boat Show will be featuring a large number of new yachts, tenders and marine products this year but, as it turns out, not all vessels at the show will be surface vessels. While megayachts have been known to carry small submarines Triton Submarines is not only launching a new line of personal subs, but also offering a new service: Triton Submarine Charters, in a partnership effort with captains and megayacht charter owners.

People who want to charter a submarine might have to wait however. Triton Submarine, based in Florida, currently only has two submarines ready for delivery. Marc Deppe, VP of sales and marketing, explains that the market has yet to fully develop and planning ahead is still very necessary. Deppe says that if the boats are to be delivered locally, in South East Florida, charters can be arranged fairly quickly. But in most cases anyone who wants delivery out of the area there needs to be at least three weeks lead time for delivery. One of the reasons for this is that Triton provides pilot, surface officer, technician and in some cases even a RIB pilot.

Passengers are not trained by receive pre-dive briefings and the crew itself is professionally trained. The two subs currently online both have dive capabilities of 1,000 foot but they have different passenger/crew capacities. The maximum capacity is currently either one or two passengers, plus the pilot. Charters must be made for at least two weeks (no maximum length) but fees are quoted by the day and include crew, shipping and any specialty equipment needed or requested. One of the first boats to use the Triton subs is the SuRi, which will be cruising in Antarctica at the end of this year. Triton has plans to add more subs, with deeper diving capability (as deep as 3,300 feet) before the end of 2013.

http://www.blueoceanyachting.com/yachting-news-and-information/general-marine-news/1937-submarine-superyachting.html

 

OceanElders

OceanElders is an independent group of global leaders who have joined together to use their collective influence and experience, supported by science and data, to promote ocean conservation, pursue the protection of the ocean's habitat and wildlife, and preserve its ecosystems and species biodiversity.

OceanElders was created to be a locus of collaboration in the field of ocean conservation. By working with and leveraging the work of other ocean organizations, OceanElders intends to encourage, endorse, and champion their ocean initiatives. The structure is optimized and the team focused to be a catalytic agent of change in order to achieve lasting impact at scale in ocean conservation and sustainability.

The idea for OceanElders began on the Mission Blue voyage to the Galapagos Islands in April 2010, where over 100 scientists, business leaders, philanthropists, and entertainment icons came together to support Dr. Sylvia Earle, 2009 TED Prize Winner, in her TED Wish to draw public attention to the urgent need for ocean protection. Gigi Brisson returned home from that voyage with a renewed commitment to ocean conservation. It seemed to her that all the efforts were admirable, but fragmented, and hence, often ineffective. The ocean needed one voice; one very loud voice. Aware of the mission and impact of The Elders in human rights, Gigi believed that a similar structure could be applied to benefit the ocean. Gigi created and funded OceanElders, developed its plan and model, and sought out global leaders who had a personal passion for the ocean and its wildlife. OceanElders welcomed Dr. Earle as its first Ocean Elder in June 2010 and has added eleven to the team since. We plan to add more Ocean Elders, including individuals from China, Japan, India, Europe, Africa, and South America.

http://www.oceanelders.org/

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   Wave Glider, a Floating Robot, Seeks to Network the Oceans ...

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1. Submarines to dredge lake for Nazi gold | World news | The Guardian

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   25 Jan 2000 – An American-Israeli submarine mission is preparing to dredge an Austrian lake said to have been the dumping ground for Nazi gold and Third ...
   
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6.  

   Patent US1497360 - GOLD-PLACER-MINING SUBMARINE - Google

   www.google.com/patents/US1497360

   GOLD-PLACER-MINING SUBMARINE DREDGE. CHARLES B. ... US4163330, Jun 14, 1977, Aug 7, 1979, Dredge cutter head having a volute compartment ...
   
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   Cape Nome Alaska, Bering Sea and Beach sand gold prospecting

   nevada-outback-gems.com/.../nome_gold.htm - United States

   Gold nuggets and flakes - placer gold on the Bearing Sea beaches: Nevada ... pan, dredge or something else you may be able to get some of that placer gold - and .... Interest in finding possible submarine beaches off the coast led to extensive ...
   
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   Gold Dredging Forum - New Zealand's Pioneer Submarine Boat

   golddredgingforum.proboards.com › General › Historical

   5 posts - 4 authors - 28 Sep 2011

   We. or at least the act thinks that a bottle dug frOm an old gold fields site is ... winches, gold stampers, dredge remains...and yes...a submarine!
   
9.  

   Submarine Dredging

   chestofbooks.com/reference/...Of.../Submarine-Dredging.html

   31 Dec 2011 – Commerce is not the only peaceful mission of the submarine. ... to aid in submarine tunnel building, to dredge for gold, to fish for pearls and ...
   
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    Gold from the Sea

    goldfever.com/gold_sea.htm

    Gold is still being profitably mined and dredged from these beaches and more .... of gold and associated trace elements in modern submarine gossans from the ...

-- Edited by admin on Thursday 1st of November 2012 05:17:41 PM

Extreme Explorer Yachts

 

On most megayacht charters, adventure means motoring from one idyllic Caribbean cove to another, or hopping among the Mediterranean’s most glamorous ports of call for ****tail hour. But a new breed of explorer yachts is bringing the same level of comfort and service one might find in Monte Carlo to the extreme ends of the Earth. From Greenland to Patagonia, these durable, long-range expedition vessels offer safe access to rarely visited regions of the world—and a host of tenders and toys for exploring them. Here we present five of our favorite megayachts for charting the adventure of a lifetime.

Built for traveling through icy waters, Aquos Yachts’ 148-foot explorer vessel Big Fish cruises comfortably from the Northeast Passage to Ant­arctica. But one of the standout features of this 10-month-old yacht is best enjoyed in the tropics: a massive foldout deck that wraps around the stern, creating a “beach” that provides passengers easy access to the water.

Charter guests can hit the water in one of several tenders and toys, which include a 14-foot Nautica RIB and a custom 26-foot boat with a 300-nautical-mile range. Big Fish packs 12 sets of diving gear (the crew includes a divemaster), as well as snorkeling, fishing, and windsurfing equipment; paddleboards, wakeboards, and surfboards; and water skis and kayaks. Crew members can capture all the action with Big Fish’s two underwater cameras, images from which can be displayed on the main salon’s three-story video wall.

Thanks to its stash of water-sports equipment, and its ability to access remote destinations, Big Fish appeals to an active clientele. “One charter party turned up in Tahiti on their [Gulfstream] GV,” says Jim Gilbert, the commercial director for Aquos Yachts. “They went directly to the stern beach [deck], unpacked their kitesurfing bags, and took off for a sail around the island.”

 

Like most charter yachts, the Lürssen-built Northern Star spends plenty of time in the Mediterranean and Caribbean seas. But with a 7,000-nautical-mile range and a hull built to ice-class specifications, this 247-foot explorer is equally suited to navigating the Earth’s extremes. Recent charters have taken Northern Star from Greenland and Norway to the Galápagos Islands and through the Panama Canal. With its hull, alloy superstructure, advanced sound- and vibration-reducing features, and zero-speed stabilizers, the yacht remains a comfortable ride in virtually all sea and weather conditions. (According to Sean Zamora at Moran Yacht & Ship, the charter broker for Northern Star, crew members claim that one cannot feel any movement on the boat while in rough waters.) The vessel’s double-thick windows—several of which slope inward to ensure that snow and rain do not stick—offer unobstructed views of the surrounding sea. For an even closer view, passengers can embark on an underwater adventure from Northern Star’s dive center.

Built by the 104-year-old Ger­man shipyard Abeking & Rasmussen, Silver Cloud has a Small Waterplane Area Twin Hull (SWATH) marked by a superwide, 58-foot beam. The bulk of the vessel’s displacement is below the waterline—a feature unique to this type of design—which makes the 135-foot expedition yacht nearly impervious to most wave turbulence. The water-bound fortress accommodates as many as 12 guests in five staterooms and keeps them entertained with a 39-foot Intrepid Walkaround outfitted with deep-sea and sportfishing gear, as well as a 23-foot Novurania that can tow toys including a wakeboard, a banana boat, and inner tubes. Silver Cloud also carries diving and snorkeling equipment, plus sea kayaks and paddleboards. It does not include a helicopter, but an aft-deck helipad is at the ready for passengers who bring their own.

During her ongoing circumnavigation of the globe, Exuma has cruised along the Pacific coast of Central America, making stops in Costa Rica and Panama’s San Blas and Las Perlas islands. This spring and summer, the 164-foot motor yacht—designed by architect Philippe Briand and built by Perini Navi’s Picchiotti division—will be available for charter in the South Pacific, where its 7.5-foot draft will allow it to nose into shallow coves inaccessible to most yachts of its size. A hovercraft and an amphibious vehicle (plus a pair of bicycles and a moped) facilitate land-based adventures, while 14- and 21-foot Castoldi tenders tow water toys that include wakeboards, skis, and inflatables. Exuma also comes with diving and snorkeling equipment, a Sea-Doo, and two Seabob personal diving watercraft.

Launched more than 80 years ago and fully restored in 2005—with a stint in the U.S. Navy somewhere in between—the 233-foot Haida G is a classic yacht built for transatlantic travel. This old-school explorer boasts a maximum range of 5,000 nautical miles courtesy of a nearly 50,000-gallon fuel tank. Its extended range has enabled Haida G during previous trips to cruise along the Pacific coasts of Canada, the United States (including Alaska), and Japan. The boat’s classic styling harks back to the golden era of yachting, but Haida G features a host of amenities and toys befitting the modern adventurer. In addition to a dive compressor and six sets of scuba gear, the vessel carries 12 snorkeling setups, a banana boat, a wakeboard, water skis, deep-sea fishing equipment, a pair of WaveRunners, and 21- and 24-foot tenders.

http://robbreport.com/Boating-Yachting/Extreme-Explorers