"The idea is simple. Each swimmer wears a GPS unit which can be activated should the swimmer become in distress. The rest is up to the Seascout, which will pick up the GPS beacon and make a beeline straight for the drowning victim and scoop them up to safety...
...Andre Harley, designer of the "Seascout", created the concept Seascout using a radio controlled boat cut in half and a Lego Mindstorms Robotic Kit."
(Above quote taken from official description).