Building a Lego-powered Submarine with automatic depth control

Really well made! The magnet-based propeller is really clever. I was curious to understand how the depth control worked and the associated blog is very informative. Turns out this is version 4 and he had tried other approaches before. The video makes it look too easy but seems he went into a lot of trouble to keep everything sealed properly.

https://brickexperimentchannel.wordpress.com/rc-submarine-4-...