About the cave Tommy Grahams Cave is located on the Nullarbor Plain in Western Australia. A large tunnel leads down from the initial entry point, moving through a more restrictive collapse area, before opening up again. This second tunnel area has an entrance to a lower section of the cave, and also ascends to an enclosed air space. With high CO2 levels, not many divers clamber over this rockpile to reach the sump on the other side. After a brief attempt at carrying my twin 100s over, I was one of the ones who decided turning back would be more sensible. Probably the most memorable feature of this cave is the access to the water. The surface of the Nullarbor [read more…]