Around sunset, Goto Dengo catches the Okinawan gulping down mouthful after mouthful of seawater. It is painful to watch, mostly because he himself has been wanting to do it. "No! It will make you sick!" he says. His voice is weak. The effort of filling his lungs, expanding his ribcage against the relentless pressure of the water, is ruining him; every muscle in his torso is rigid and tender.