I came up with this question, and asked a few of my friends, and none where able to answer it, well, at all, until I asked my physics teacher. Question is if you where to make a box, that if pressure is applied to it it would make electricity and, dropped it into an ocean trench, where the pressure of the water would make the electricity, where would that energy be coming from? After a few days I finally questioned by teacher. His answer is very interesting. The energy comes from the water pressure, around the box, which comes from the displaced water, which comes from the act of the box falling to the bottom of the ocean, which comes from gravitational potentail energy, which comes from the formation the continents, where the box's parts where formed above the ocean.