A young man from a wealthy family goes on a trip around the world as a sailor - such a strange diploma practice. In the area of the Bermuda Triangle, a research vessel falls into one of the mysterious phenomena of this zone and Gregory falls overboard, flying into another world, coming to his senses on a strange ship, more like a submarine. There is an ocean all around, the ship itself is sailing somewhere, and in addition, someone is always trying to talk to it - someone invisible and speaking an incomprehensible language...