Some inspirational pages:
OpenROV is an open-source, low-cost underwater robot for exploration and education.
It’s also a passionate community of professional and amateur ocean explorers and technologists.
A exploration ROV with operation depth: 3000 ft, 914 m.
Thruster plans can be found at: https://www.dropbox.com/sh/35tuy8w8eqgbqmj/AABvNNSgETQgje4NH3BPpjgKa?dl=0
http://www.gigabots.de/ – Peachmunic -youtube. interesting project nice glass bubble floats. Even made his own ESCs.
http://www.bushcraft-scotland.com/ – Gavin’s website