Every time I watch this video I’m like…WHAT. The technical term for this is Surface-supplied diving, and this type is known as compressor diving.
Seriously 40 metres, no safety stop, not even a slow ascent. Their DCS (Decompression Sickness AKA “The Bends”) symptoms are so bad some of them go back down just to relieve them.
No BCD, and some of their fins look like ping pong bats..
Apparently one of the cameramen went for a drive dive using their gear..pretty scary stuff.