How does Boyle's Law take place during caisson disease?

caisson disease, or the bends, occurs when a diver breathes air while their on the bottom and they don't release until the get to the to. Boyle's law states: the volume of a sample of gas at a given temp varies inversly with the applied pressure. So when the diver breathes air on the bottom of the ocean and doesn't relese it, the air expands and causes dizzyness and acute headaches. you know, the bends.