The pressure in the cabin of an aircraft is less than atmospheric pressure. Scuba divers are advised not to travel by air for at least 24 hours after a dive. Explain what they might experience if they ignore this advice.

Gas under higher pressure (under sea/lake) dissolves more readily in liquid (diver’s body). So the diver’s body could contain more dissolved gas than other peoples bodies.

When the pressure is suddenly lowered (aircraft cabin) the solubility of gas drops sharply and it separates from blood forming small bubbles in blood vessels. Blood turns fizzy. I expect it is not good. (

Similar process is when you open carbonated water bottle (that is more intense of course) or simply ascend from deep water too quickly.