The clear water is almost invisible. Diver looks like he’s suspended in air.

Especially well developed haloclines occur in the Atlantic Ocean, in which salinities may decrease by several parts per thousand from the base of the surface layer to depths of about one kilometre (3,300 feet).

 

The result is pictures like these where the diver appears suspended in air (well, minus the bubbles of course). The saltwater serves as the river layer ( murky water) and the freshwaters stays on top.