My quick and dirty data acquisition boat built during high school. Everything was manually operated with a 4-channel radio transmitter. Even though this boat wasn't a robot,  it did provide a starting point for many creative uses of switches, servos, electric motors and gearboxes.

I had one holiday break to design, build and test this boat for a high school biology class. 

Link for high speed connections 
-contents on one page

mpg: boat functions (1,400KB)
mpg: catching fish (490KB)
mpg: releasing fish (677KB)