. >> mario vitton is a helicopter rescue swimmer. gentlemen, thank you for joining us., let's talk about the difference between rescue and recovery as kyung said, they're trying to keep the spirits up of the parents waiting onshore. but there is a real danger there, isn't there? >> well, there is, and i think given the operational tempo of the divers she mentioned, and the enormous pressure to do that work, it is going to be very important to do that work. they need to start calling it recovery. the fatigue they're under, the pressure they're under. because on a long enough time line, now we're going to talk about hurt or worse divers. so they're going to have to soon decide to say yes, it is a recovery. and that will change the way they approach it. and i think it is time for that to happen. >> help us understand what the divers are going through right now. just the currents there, the water temperature. the visibility. how difficult is their task? >> well, difficult is one thing, it is just extremely dangerous. they're basically cave diving in an unknown cave without