“After about 30 seconds, blood vessels in the arms and legs constrict, redirecting red blood cells to vital organs, including the heart and brain … After a minute or so, trapped carbon dioxide causes the diaphragm to spasm … Keep going, and eventually the spleen will release stores of red blood cells to keep you alive for a while longer. Below 50 meters, capillaries around the alveoli in the lungs expand to create a cushion to protect the rib cage from collapse as pressure increases on the body. Most people will shortly lose consciousness.” To many, the description above sounds like drowning. To others, as Bloomberg reports, it’s freediving, the lung-crushing, mind-altering path to inner peace. (I think I’ll stick with Xanax.)