burner_brown

I thought of a hypothetical idea this question could help, but then realized maybe it is relevant. If we wanted a battery operated vehicle roving around at the bottom of the ocean, it would be nice if it could recharge itself automatically and not have to come to the surface all the time. Maybe a large solar panel floating on the surface of the ocean and a long cable going down to the bottom. The vehicle could charge whenever it needed. However, a copper wire 6 miles long would have high resistance and weight a lot. But sending light though a fiber optic cable could be an answer. Because the charging station is 6 miles down in the water it couldn't have electrical contacts, but could use magnetic charging similar to wirelessly charging your cell phone. How would you convert the light energy from the fiber optic cable into something that could charge the vehicle under water? If it could be done, it would be extremely slow charging but still better than traveling 12 miles round trip just to charge. Be nice when you rip this apart :)