does lego still have robotics and pneumatics parts? they could have significantly upped the legoness of it if they really tried if so
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lego.com/en-ca/product/ is current set. Programmable and can be remote controlled.
lego.github.io/MINDSTORMS-Rob are the official MicroPython programming docs.
Several current Technic sets use pneumatics but there's also the option to buy them individually:
lego.com/en-ca/pick-and
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Other than the shell and strong enough magnets, I'm sure it can all be done with actual LEGO parts.
Propeller blades in education.lego.com/en-us/products are likely too large for underwater use although it might work if gears are set up to turn them quite slowly. Might be other options.