Terrifying History on Instagram: "In November 2016, disturbing underwater footage emerged from a diving excursion near Cape Town, South Africa, showing a novice diver’s near-death experience. The video captures the moment the woman, on one of her first ocean dives, suddenly panics at a depth of 50 feet, violently removing her breathing regulator. As she begins inhaling water and flailing uncontrollably, her quick-thinking dive instructor intervenes, forcing his backup regulator into her mouth wh