You can operate whatever you want.
This thread is OK with me, and Zutai, and Ocean is OK with me.
If you do not like this thread, go start one for yourself.
The cyberspace is even bigger than the ocean.
My opinion is to buld a geodesic spere. The base units would be triangles made of
rigid polyurethane foam covered with ferro cement and some steel pipes inside the foam.
The reinforcing pipes would form the core of the geodesic dome.
Each triagle would be bouyant enough to float, in case the dome falls apart it would not sink.
Or not all of it would sink.
The dome would be partially above the water, about 20%. The rest of the dome would be flooded.
The under water part of the dome could be used for farming fish, nor else.
The above the water part would be possible to seel water tight in case the need to submerge the
Structural triagle part of the dome, spere could be prefabricated on land and assembled in water.
Different sizes of domes could be built. I would start with a small one.
The fish farm square, that was built in Hawaii is , I guess 27 feet diameter.