Was also really emotional at the end. All three of us - me, dh and 20y dd - felt somewhat emotional and chocked up, despite knowing the outcome.
The film did mention the timings - it was in the writing underneath how long each stage took to get through and how long to get back, and I'm sure one of the divers talked about in in the film too, when discussing how to get the bits out. They weren't convinced they could get them out alive due to the length of the dive and it's difficulties.
If I remember rightly they ended up so far in due to the rising waters. They were trapped from being able to get out quite quickly, so had to go further in where they thought they could find higher ground to be out of the water.
I found it really heartening that the families didn't blame the coach. In our, and many other countries, he'd have been the scapegoat. There he was held up to be heroic for helping and supporting the boys throughout the ordeal, teaching them to meditate to stay calm, etc. Instead of blaming him, they supported him. It was heartwarming to see/read.