According to AFP, more than 100 chimneys are being drilled into the mountain in a bid to reach children trapped in a massive cave complex below.
The third option being explored now is drilling a shaft through the mountain where the cave is located.
“Some (of the chimneys) are as deep as 400 metres… but they still cannot find their location yet,” Narongsak Osottanakorn was quoted as saying by AFP, adding that the rescue mission lacked the technology “to pinpoint where they are staying”.
“We estimate that (they) are 600 metres down, but we don’t know the (exact) target,” he stressed.
Rescuers had managed to establish a line to pump in fresh air and had also withdrawn non-essential workers from chamber, where the rescue base located.
Authorities initially suggested waiting until the end of the rainy season in fall but rescuers now warn of a dwindling lack of oxygen and upcoming monsoonal rains flooding the cave.
When rescuers first reached the trapped boys they reported they had heard dogs barking, roosters and ‘children playing’ suggesting there may be an opening somewhere deep into the cave which is being searched for by rock climbers and ‘bird watchers’ familiar with the area.