Buddy Dive System News Today

Could do tandem dives. like a buddy dive system. no professional diver would go by themselves. you always go two or more. . >> did it surprise you that this vessel didnt appear to have any kind of back-up? >> im sorry. i cant really speak to that. i did see some images and i didnt see what i would expect in terms of sensors or hydrophones or tracking beacons. that doesnt mean theyre not mounted on it. it would be very surprising if such equipment were not carried by the sub. >> max cramer, we ve...

For us again tonight. >> reporter: tonight, the time for waiting is over. originally ruled out as too dangerous, rescuers now believe they may have no choice but to dive the trapped boys through the maze of flooded passageways. the new danger, low oxygen levels in that cave posing a significant threat to their survival. officials say there is a limited amount of time to get the boys and their coach out with flooding rains closing in. >> the storm is coming. and now you have more dangers because ...