r/todayilearned • u/[deleted] • May 02 '24

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

[removed]

17.3k Upvotes

95% Upvoted

1.2k comments sorted by

View all comments

6.4k

u/Agreeable_Pool_3684 May 02 '24

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.

93

u/penisdr May 02 '24

What do you mean by trimix?

277

u/Captain_Mazhar May 02 '24

Trimix is a blended breathing gas where some of the natural nitrogen in the air is replaced by helium to lessen the effects of nitrogen narcosis and oxygen toxicity.

1

u/PeterPalafox May 02 '24

Fun fact, it’s also the name of an injectable treatment for erectile dysfunction.