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In 2025, People Will Try Living in This Underwater Habitat
(spectrum.ieee.org)
This is a most excellent place for technology news and articles.
Build them as connectable hexagons. Learn from the insects, they've had a half billion years to figure out what shit works and what shit don't.
Sure when in air. Not so much for underwater or really anywhere where they have to deal with a pressure differential, either positive or negative, where large flat sides are detrimental.
The hexagon is only stronger than a circle if you're gridding it.
EDIT (stronger for the TOTAL material used)
Did you mean "truncated icosahedron"? A hexagon is 2d.
Nah if you only build a 2D structure, you won't have to worry about the water pressure because your structure will likely not be able to interact with 3D matter. It's genius engineering IMHO.