Beriscope

Bersicope is a toy like contraption that comes with a water-resistant camera that is secured at the end of a retractable line. Throw this camera into the water, mimicking a fishing line, and watch the underwater marvels unfold before your eyes via the special viewing goggles. (Pics)

Beriscope can also be used by the pros to scout for great diving locations.

Via Yanko Design