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For a submarine having a lot of viewports is having a lot of weakening in your hull. On the other hand a traditional periscope as only "window to the outside" is not really a good solution for a civil yacht. Captain Nemo had a big window named " the nemo eye" to look at the landscape nobody ever has looked at before. Jules verne pictured it as a glass window - later explorers used acrylics for submarine windows but it was not until the invention of the plasma screen that "full 360 degree round vision around a submarine for the whole crew became a feasible option.

Combine a camara and a plasma screen wall gives you the best of all worlds - a better view than a nemo eye or a acrylic dome can give you. A hull "without weakening holes" in it. Integration of satelite navigation, echo sounder images, ROV images, nightvision, in one "virtual ambient".

As Bob Ballard puts it - Viewports on research submarines are obsolete technology today. - and the best of all plasma screens are much more economic than acrylic viewports.