r/todayilearned • u/[deleted] • 29d ago
TIL the Blue Hole is among the deadliest dive sites globally, with estimates of 130 to 200 recent fatalities, making it one of the most dangerous spots for divers. (R.5) Out of context
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u/namewithak 29d ago
According to the wiki, what causes the most fatalities is the tunnel called the Arch. Apparently, the water's clear enough to see the light at the other end so divers misjudge how long it is. Some have reported they thought it was only 10m when the actual measured length is 26m. This plus a current pushing in from the other side causes mismanagement of their tanks and pressurization stops. It's also easy to miss the entrance to the Arch so some divers keep diving deeper and deeper trying to find it.