Whats the test called you have to take were you are in a cage or somming and it feels up with water?

Question

there is a test my friend told me ages ago i think you have to do it when you are trainning for the fire brigade or if you getting a job on the boats sea resque or somming you have to do a test were this cage is in a big like speciul swimming pool and it feels up with water with you in it and i think you have to get out in time or sommingsounds really scairy just wonderd if anyone knows that test i am talking about and can help me because i like to check it out on youtube see what the machine is like or if anyone knows the name of test or what job it is that has to take it thanks for your time

many thanks

takecare drew

Answer 1

this is a witch hunters test. if you drown then you are not a witch and go to heven. if you stay alive then you are burned at the stake.

Answer 2

there is a test used in the Navy and Fleet Air Arm,where new recruits are seated in a mock-up of a helicopter cabin,and it`s lowered into a huge tank of water,and allowed to roll over.They then have to undo their seat belts,and escape by themselves,all as part of their training