This page just has a few pictures of my submarine in the local pond. I spent ages getting it balanced in my test tank, and apart from a bit of roll pending which way it turned which I think is due to the hull shape, it went really well.
The only problem was it needs a more powerful motor, as weighted down its quite a heavy lump, so takes quite a bit or power to move it, and even more to slow it down or stop it, but changing the motor it not a problem.