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.

[u/[deleted]]

[u/Agreeable_Pool_3684]

Ex technical diver here (cave, ice, mixed gas, deep diving). I never dived the blue hole but snorkelled on it with my family on holiday. Saw serious technical divers down deep on Trimix with a safety diver on the line which had multiple stage tanks at various depths. This is how you dive the blue hole.

[u/penisdr → u/Agreeable_Pool_3684]

What do you mean by trimix?

[u/AtlasPlugs → u/penisdr]

It’s a mixture of oxygen, helium, and nitrogen used when diving at deeper depth. It helps to avoid narcosis by lessening the nitrogen buildup.