Building submersible living space is economic. I have been there i have done that.
Try to think about this as a “space enclosure problem” - what you want is to enclose a maximum of space Draupner wave safe with a minimum of building material. The mathematical optimized method would be a SPHERE. Happens that a sphere is also a extremly wave crest impact resistant form and at the same time a pressure resistant form. So it is not a coincidence that survival pods are small shells.
See more about the bubble living space concept here:
So if you think it through and do experiments on it you will find that the idea “Making it totally submersible costs too much” is a complete misconception - comming from the idea that “submarines are expensive” …
You can trust my criteria on that i have built and tested that kind of shells…
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