Karst cave in the limestone rock opened on one of the beaches of Odessa between the beaches of the Dolphin and the Chkalov Sanatorium.
So, after the winter storms and heavy rainfall, there was a collapse of the rock and the entrance to the real cave.
Note that over the cave is a newly built sports ground.
However, the lack of elementary hydrogeological research led to the fact that the site was built on a natural drain, becoming a kind of dam for the flowing water.
On the cleft, numerous cracks formed and water began to leach out the limestone layer under the site.
It should be noted that the cave is unlikely to last long, as well as the playground above it. Natural geological processes will collapse them into the sea.