Is it the same four divers who are going in after the boys each time, or are they sending fresh divers each time they go back in to get two more boys out?
Each boy is being accompanied by two divers.
Ex-U.S. Navy SEAL explains why so many divers are involved
Dave Sear, a former U.S. Navy SEAL, joined CBSN to explain why there are 90 divers involved in the rescue mission and what kind of assistance the U.S. can offer Thailand officials.
Fifty of the rescuers are from Thailand and 40 others are from across the world. Sear said some of the divers are likely staging oxygen tanks and fixing lines of rope along the cave.
"A rope will go along the entire cave to guide them so they can find their way out of the cave. They will make sure it is in place. Then you are going to stage oxygen bottles or air bottles, depending on what they are using, along that route so that they can switch out as they go. They will have bottles there so they can refresh them, and put new bottles on.
The other divers will get them out and replace them," Sear said.