First two boys reach the surface at 5:37 local time

Four now out of danger

Eight more boys and football coach remain to be rescued

Rescue due to resume at 8am local time after air tanks replenished

13 foreigners taking part in rescue

Meet the 'A-Team' of heroic volunteer British divers who led search

They allowed themselves smiles, but there was no cheering among the exhausted rescuers emerging from the Tham Luang cave system on Sunday evening.

With the first of the monsoon rains falling on the limestone hills above their heads, Thai Navy Seals and elite cave divers from around the world had pulled off what many thought was impossible - guiding four boys though a terrifying underwater journey in one of the most daring rescue operations of modern times.

But with heavy rain setting in at dusk, it was plain to authorities and locals that they now faced a race against time to rescue the remaining eight boys and their 25-year-old coach from their air-pocket prison 2.5 miles inside inside the mountain.