Some of the tools used by GUE cave divers: the semi-closed circuit Halcyon RB80 rebreather and Suex DPV (Diver Propulsion Vehicle).
90 Metre Room in Tank Cave
Australia's Tank Cave has tan-stained walls, which is what makes this room so outstanding. The collapsed slabs of rock have revealed the internal white of the limestone. The cave's tunnels spider out in multiple directions from this room.
Cave diver snagged on the guide line. Even something as small as a drysuit pee valve is an entanglement hazard for cave divers.
Using underwater photography to look into caves
Cave diving is a sport that requires a lot of training and equipment. It's not even something that most people have an interest in doing themselves. However, many people are intrigued by what we find in underwater caves. I use my underwater photography as a portal for non-cave divers to look into caves.
This floor formation formed when the cave was dry, but may have held a pool of water. Now the cave is fully submerged and these fragile formations are enjoyed by cave divers.
Sac Actun Mexico
Columns like this one from cave system Sac Actun in Mexico may take thousands of years to form.
Diving for science
Teams of cave divers coordinate efforts to collect samples for scientific researchers.