The first step in the Deep Sentinel program, one of the most ambitious ocean-engineering projects in decades, will be completed this year. This initial step, called Vanguard, will shelter three aquanaut-scientists at depths of 100 meters. Eventually, the project will create a modular underwater habitat system that will let scientists live underwater for weeks at a time.
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.