The South and Mid Wales Cave Rescue Team declined to comment on the rescue while the BCRC said it does not name the cavers it sends on operations to "allow them to get on with their hard task without distraction".
"The Seal unit last night reached the T-junction and today they will press ahead to the left, but one obstacle we've found is a very small hole which we need to widen so that people can go through", Governor Narongsak Osotthanakorn told journalists on Monday.
There have also been suggestions that drilling could be another way to get to the boys, and to help them out.
Rescuers had been hopeful of getting through a cave and to a larger, deeper chamber, informally named Pattaya Beach, where the group, members of the Wild Boar soccer team, is believed to have been trapped by the rising water.
Thai Navy SEALs made contact with the boys and their coach in a tunnel about 1,300 feet beyond a chamber called Pattaya Beach, where rescuers believed they had sought refuge.
They still have to be extracted from the caves, and are reportedly "too week to move". They ask what day it is.
"You have been here ten days", a British rescuer responds.
A massive worldwide rescue effort has been under way since, with rescue teams battling through thick mud and high water to try to reach the group.
The council said many of caves have been explored by British cavers and divers, "bringing with them valuable knowledge of the layout of overseas cave systems".
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Aisha Wiboonrungrueng, mother of 11-year-old Chian, said: "I'm so happy I can't put it into words".
Prime Minister Prayuth Chan-ocha thanked the global experts and rescuers.
A glimmer of hope as rescue teams find a possible opening, but there is no guarantee it will connect to the main cave network.
"I think in truth even the families of the missing boys and their coach would say that this is astonishing news", said Holland. The first plan, we will drain all water out from the cave then we will take all 13 people out of the cave. They clearly want to stabilize the boys before they try and bring them out.
Rescuers are now working to drain the water from the cave and provide necessary medical attention to stabilize the boys before extracting them.
But it was feared run-off water from nearby farms could carry risky chemicals and bacteria.
Investigators say the boys crawled into the Tham Luang Nang Non Cave through a narrow 15-meter long channel.
A sign outside the cave warns visitors not to enter in the rainy months from July to November.