I've looked around the internet and found lots written about some of the bad science, like the fact that the crane is much lighter than the rig so it wouldn't have dragged it along the seabed and such.
What I can't find any info on is deep sea diving without a suit.
There are various scenes where characters hold their breath and swim through the water in just their regular clothes and I was figuring, at that depth their bodies would probably be crushed by the pressure.
WOULD they be crushed by the pressure? Or would it be safe to swim at that depth without a pressurised suit on?