Water games with robots are fun. I doubt it's something that FIRST would ever do....
We've been playing with underwater robots for several years. If you want to join the fun, enter NURC (in Phoenix). The 2014 game will be announced Jan 1st.
https://sites.google.com/site/nation...waterrobotics/
....and keep an eye out for the movie,
La Vida Robot, next fall.