of the tube suck water out of the cave, part of the pumping operation that made this rescue possible in the first place. where it s too steep, pictures show the boys hoisted through the air, a pulley system attached to a hanging structure. below, rushing water makes for a swift current under foot, illuminated by rescue headlamps. it s all incredibly dangerous. flooded passageways the definition of peril, heartbreakingly illustrated with the death of a former navy thai s.e.a.l. he died after bringing oxygen supplies into the cave just days before the rescue began. his navy s.e.a.l. brothers carried on their mission in his name, diving, swimming, and carrying the exhausted kids and their coach for hours until they could make it out far enough for initial medical treatment. a final picture shows the last eerily illuminated steps, heroes freeing the team from their subterranean prison. translator: this unit is not only with chiang rai, thailand, it s a global unit.