The truth behind these photos is even more interesting than the photos themselves.

Complete with banks, snags and fallen leaves on it’s bank, this swimming hole has it’s own river

Sea water which is rich in hydrogen sulfide is much heavier than ordinary water. Because of this, it sinks down and forms a second layer of water in the shape of a stream.

While the effect isn’t technically a real underwater river, it’s the closest you’ll ever see to one.  You can dive into the second river from the first, sit next to it on the bank or follow the it’s route the rough swimming hole.