From Indiana: To make it easy I am sure it is a statistic that most divers do this.The more training you receive the more they teach you about noticing signs of a diver in distress.It is a practice to make diving a safer sport.If you like to put your mask on your head dont get upset when somebody ask you if you are in distress and if you a re on a dive boat out of Jersey you will get yelled at.DIVE SAFE