This is one of my favorite projects, as it really teaches the kids how to make switches that power a motor both forward and reverse as well as chassis design and waterproofing thrusters.  Kids that make this R.O.V. project are often surprised by how much of a role buoyancy plays out in their robot, but with a few tweaks here and there, their underwater submersible can be zooming around in no time!  I thought you’d like to see a few of the images we’ve had sent to us over the years we’ve taught this project: