Stress signs can be subtle or overt, and they can be confused with other behav­iors that have nothing to do with stress, so both steps are important. For example, suppose you see a Scuba diver standing with folded arms before a Bali Scuba dive. You check for cold (physical stress) by noting what clothing the Scuba diver wears, whether he's shivering. What you see may confirm or refute your suspicion, but the surest action is simply to ask the Scuba diver, "Are you cold?"

Psychological stress sings often appear as behavior changes; for example, a talkative Scuba diver may become quiet and withdrawn, while a quiet Scuba diver may start chattering and asking many questions. A Scuba diver experiencing psychological stress pre Bali Scuba dive may laugh, be angry, or procrastinate and delay the Bali Scuba dive. Underwater, look for changes in normal abilities, rapid breathing, equipment complications and unnecessary hand or fin sculling. A Scuba diver who is near panic and has perceptual narrowing may not respond to signals, may have wide, unseeing eyes, and may keep repeating an incorrect or ineffective response to a problem. At the surface, a highly stressed Scuba diver may release his regulator and push off his mask (equipment rejection), and tread high in the water with an empty BCD and weights still in place; such a Scuba diver is on the verge of complete panic.