The local Super Walmart had a remote control submarine from a company called Motorworks for a mere $19.99, cheap in comparison to the average $69.99+ that most other R/C subs sell for. The 14-inch long plastic sub actually works really well in the pool, able to dive all the way to the bottom and run around under full control four feet under water.
Some video:
- Surface Run (2.6MB, quicktime)
- Dive! Dive! (4.1MB, quicktime)
The things are getting a lot of good reviews from the R/C community, and several people have started modifying the little beasts with more beefier parts.
Really, the thing is impressive for how inexpensive it is, and Ill no doubt be geeking out with the pool for awhile.