Probably the best concept of all for ocean colonization is the submerged bubble concept.
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When we talk about colonizing the oceans we should think about the most basic unit that will allow to survive on the open ocean
As the development of the rescue boat shows a open boat that gives you flotation is not enough (you would die from overexposion to the sun or get trown over by storms. So the kind of living space the manufacturers ended up with, is a kind of all side closed "bubble" that protects people.
Given this development we might be wrong when we look at platforms of any kind - platforms do only work when there are "buildings" or "containers" on them that enclose the living space. -
But this is doing 2 engineering tasks (platform building - and housing building) to perform a single task - "enclose the living space properly to make survival under any sea conditions possible".
What if we go away from the "platform idea" and go to a "integrated enclosuse" that encloses the living space "bubble like" so we would think more of floating shells, domes, spheres, rounded shapes, to enclose our living space in a open ocean capeable way.
Once you think of a "living space bubble" more than a "platform" you might ask the question how high above the water or "how wave exposed" do i want the living space bubble to float ?
Would not submerging or partially submerging the structure have big advatages in wave movements temperature control and position keeping - protecting it from the hostile ambient of the surface layer where athmosphre and ocean have their most violent interchange.
How would living beneath the surface be? - has anybody analyzed those already existing structures that are basicly "spar designs with extended underwater part" where people live in the underwater part - not in the elevated platform. When reading the seasteading book if find submerged designes as "dismissed concept due to complication of holding a controlled depth and cost of building" - do we operate with the correct assumpions here?
At European Submarine Structures AB we create submerged living space at a general cost of 331 Euro/ cubic meter which is below the average cubic meter real estate cost in Europe.
Many structures that already exist have explored the concept of submerged living space. Among those the red seastar restaurant and the jordan submarine observatory.
The making and float out of submarine tunnels, the rion-antirion bridge pylon, the ekofisk storage tank, Troll, and similar structures have tested and refined the necessary engineering in big scale.
Creating submerged bubble living space in the high seas is not only possible, economic feasible, it is potentially the most easy way to deal with wave hazards and seasteading real estate cost.