We did a WESTPAC deployment and worked with the ROKs on some combined ops. We doing diver ops off the northern coast of Australia, a ROK officer and NCO were dive buddies, and we had a pretty simple nav course (like, swim 1,000 yards on heading 035 to first buoy, then 1,500 yards at 180 to second, etc.). Every dive team set off in 15-minute intervals, the end was on a beach. We were on the beach when they came out. The officer was blue and barely breathing, the NCO was madder than hell. Through broken English the NCO said about 3 minutes out from the beach the officer ran out of air and wanted to ascend, he told the officer "no", dragging him, keeping him from ascending. So basically the officer almost drowned because he held his breath for about 3 minutes. The ambulance had to take him to the hospital, he was barely responsive.