In normal missions, all people on board are well trained-because they have to go through lots of training....
As far as i know, everybody who is going to work on a rig in the sea has to pass underwater egress training-or is this not an international standard?
Before each flight, we have briefed all passengers telling them exactly what to do in an emergency situation....
Luckily, i never had to try if all emergency maneuvers would have worked as we briefed them....