Rebreather diving is currently one of the fastest growing activities in the diving universe. Divers’ motivations for getting a rebreather vary. Some derive enjoyment from “piloting” a sophisticated machine like a cosmonaut journeying through (inner) space. Others find pleasure in possessing a powerful tool for exploring caves, wrecks, canyons and reef walls, and being able to silently approach and photograph marine life without any bubbles.

Two buddies are holding the line. The second is holding the arm of the one leading the way, communicating with him by means of touch. With visibility nil, the first buddy protects his head and face with his hand in case of contact with a wall or rock.

Suddenly, for some unknown reason, the line moves and goes out of their hands. They search for it but to no effect. Their mistake: they were not holding the line properly. Will they panic? No. Their nearby instructor stops the exercise. The entire scenerio took place on dry land.

How to master the complexities of extensive explorations of underwater caves and other overhead environments. Distance of 700 meters from the entrance to the end point. The depth of 164 meters at the beginning of the actual exploration and 186 meters at the end. Duration of the dive, which including deco stops, required a run time 9 hours and 46 minutes submersed.