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"We are 30 meters deep, fresh water, then 60 meters deep - salty water and under me I see a river, island and fallen leaves… Actually, the river, which you can see, is a layer of hydrogen sulphide," Anatoly Beloshchin said.
This underwater river is a complete river like any conventional one. It flows as much as 115 feet deep at some places, with flow of both fresh water and salty water at varying depths.
Scientists have suspected that undersea rivers can form, after sonar scans of the sea bed have revealed meandering channels in many of the world's oceans.
Ever since news of such rivers under sea were public, scientists all over the world have been looking for more such examples. Many have been found and even more will probably be discovered in the near future.
I didn't see a waterfall in the links, but the water the divers are swimming in is sweet water or fresh water. The water in the pools and river is saltwater as it' is heavier. I don't believe these are "under the sea". They are collapsed formations of limestone. They're abundant in coastal areas on the Yucatan peninsula. I guess the geology is suitable for their formation. Got this info from wiki.
How is the waterfall possible!?
edit: Unless some hole that does not have the same salt concentration, causing the HS to "fall".. but that would be almost impossible.edit on 2/28/2014 by luciddream because: (no reason given)