Portions of the following information were taken from DiveDoc.net

This system gets its name from the fact that there used to be a water tank directly over the top of the entrance. Tank Cave is a a very extensive system with over 7km of mapped cave passage. It is one of the the longest underwater caves in Australia.

Rumoured since the late 1960s as a "cave diving site" of some type, this amazingly extensive feature is today considered by many to be the the best cave diving as far as South Australian cave diving sites go.