Sinkholes are particularly abundant in places with Karst terrain, where the rock below the land surface is soft, eroding over time and eventually giving way, creating these deep underground caverns.

Sinkholes mainly occur in what is known as ‘karst terrain’; areas of land where soluble bedrock (such as limestone or gypsum) can be dissolved by water. With cover-subsidence sinkholes the bedrock ...

However, some karst caves pose significant risks due to their complex terrain and hidden dangers. Five researchers from a cave aquatic biology team explored into the caves in Huowang River in ...