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Cave diving
Cave diving is one of the most deadly sports. In case of a failure you are doomed to die. No time to repair or heal the injury. It is diving beneath the caves which are at least partially filled with water. The extreme factor is that once inside the cave, you have no option to swim up since it is covered with a roof. So, either you swim ahead and find your way out or go all the way back. Low visibility and oxygen, strong water currents, unpredictable caves also pose a problem.
