A strange, deceptive river

This is a real photo of a murky river, 
but all is not what it seems. 
Can you tell what's going on?
(Click to enlarge)

Another photo of the same river, 
this time with leaves on the shore.
A vertical black bar covers a clue.
(Click to enlarge)

Scroll down for the answer.

Here is your clue.

The river is underneath the water.

The river is an underwater river, 
and is composed of hydrogen sulfide.
(Click to enlarge)

The photos were taken by diver Anatoly Beloshchin in a cave at Cenote Angelita, Mexico.

A video of the underwater river explored by divers

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