A huge blue hole has been found off the coast of Mexico - an underwater vertical cave.

In depth, it is second only to the 300-meter hole found in Sansha Yongle in China. The Yucatán blue hole was named Tam Ha (Taam ja ') - "deep water" in the Mayan language. Its surface area is 13.690 square meters. The cave has very steep 80-degree slopes. Scientists have yet to study the microbes and other organisms that inhabit it, as well as study the geology of the cave. Blue holes appeared during the last ice age. Then the sea was a hundred meters lower than it is now.