It'll be like that scene in trainspotting, but with a robot.
So this XKCD has been on the mind a lot! I'm fast-tracking a submersible borgish ROV "cube" equipped with a Pan Tilt Zoom HD camera, and if all goes well, there will be full XYZ motion too! The main system of propulsion is 8 bilge pumps. I chose these as they are designed to work underwater, and can also do nifty things like filter the water. Anything designed for heavy duty in a marine environment, should be good enough! The drive system will be joystick controlled. Though, if things go "too well," I might end up adding some cursory roving functions. Hopefully this will debut for February "robot" nightlife at the academy of sciences, if only I can finish it! I'll update when/if it works, especially if it becomes more than a PVC brick :)