Burkhard Bilger wrote about cave divers a few months ago in the New Yorker. It is full of delightful scenes of adventure and incipient horror, as our divers enter apparently endless labyrinths of jagged rock and running water. Undoubtedly there is great beauty under ground, and there is also the constant dread of dying by suffocation or drowning, far from where the sun shines.
Burk narrates an overview of the cave diving life in a video at the New Yorker.
His piece is exciting and rewarding reading, but the following clip will give you a case of the willies because the fear and danger are so imminent, and hardly an arm’s length away from safety. At least this time.