Boys to be split into four groups - reports
The trapped boys will be divided into four groups, the Bangkok Post is quoting a source as saying.

It says the first group will have four people, with the second, third and fourth containing three people. The coach will be in the final group.
Coach Ekkapol Chantawong (left) is among the last 3 including 2 boys to be escorted by divers out of flooded #ThamLuang cave: Rescue authorities. #D-Day
The Thai government has published a graphic detailing how each child will be rescued.

Two divers will accompany each boy, who will wear full face masks as they are guided through the passageways by rope.

When facing a particularly narrow path the divers will release the tank from their back and slowly roll it through as they guide the boy through. This means that the boys will never be alone, as had been previously feared.

They will then walk from chamber 3, which has been drained to the extent that it is possible to walk in it, to the mouth of the cave that they entered on June 23.
Thai government releases graphic about #thamluangcaverescue . Full face masks; 2 divers accompanying 1 boy; guided by rope. When facing a very narrow path, they will release the tank from back and slowly roll tank & guide the boy through. They walk from Chamber 3 to mouth of cave