one. underneath each diver. so each diver had a boy underneath him as they submerged into the water. the boys wearing full scuba masks and then after about a mile, they were able to reach what's called chamber three which is dry, and from there, they could walk, but all told from the place they were to the mouth of the cave, it's about two miles, and remember, these are boys who were weakened, who didn't have anything to eat or virtually nothing we understand for nine days. so an extraordinary operation. they held onto guidelines. they had oxygen lines along the way. there were divers all ago tlong way, but remember, david, this is a potential death trap because a few days ago, a very experienced highly trained thai diver collapsed and died due to lack of air. so let's not underestimate this operation. it is potentially deadly, but it was extraordinary. it was launched in very dramatic