Inside a mysterious underwater fog that's "like another world" and baffles divers

Cenotes in Mexico are deep sinkholes considered sacred by the ancient Maya and where sacrifices took place - but some believe they are threatened by the human activity

The magnificent 'El Pit' in Yucatan, Mexico is a diver's dream - but at 55 meters deep it is only for the experienced (

Image: mediadrumimages/@francisperez000)

Divers exploring caves in Mexico have shared photos of the descent in swirling fog caused by alternating layers of fresh and salt water, creating the illusion of an underwater river .

A great shot showed that the narrow pit opening allowed rays of light to enter the water, reflecting through the clear water.

Underwater photographer Francis Perez, 52, dived into a mysterious cenote - a deep sinkhole - called "El Pit" in Yucatan, Mexico.

Captured on a Canon 5D MKiii camera, Francis aimed to preserve these incredible sites, protecting them from encroaching development.

He said, "It's like flying over a river. A river in water.

Underwater photographer Francis Perez fears for the future of cenotes (

Picture:

mediadrumimages/@francisperez000)

"It's like another world, a mysterious place.

"I...