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Andrew Ryan and Walt Disney look alike.

Disney built an automaton resembling Julie Andrews that could jerk you off, tug your balls, and talk dirty. That was peak Disney. It’s in a warehouse in Culver City.

I'd bet he didn't.

I've always imagined an undersea house/neighborhood could be doable.

Start with something like this:
https://hipehabitat.com/2011/10/04/geodesic-dome-with-solar-wind-geothermal-power/

use the dome part made of hollow pipes and fill those with liquid nitrogen. The supercooling of the nitrogen produces a very strong undersea "igloo".

Add a long stovepipe chimney to it - keep it at atmospheric pressure ( if the engineering stress analysis of the igloo supports it).

Freeze in a double hatch system to allow deliveries, etc.