May 26 (UPI) — Authorities in Laos were in a race against time and the weather Tuesday as day 7 of an operation to rescue seven people trapped in a flooded cave in a mineral-rich region north of the capital, Vientiane, came to a close.

The group, all locals, became trapped by landslides triggered by heavy rains on Wednesday after entering the remote cave, which is accessible only on foot, in the central province of Xaysomboun on a hunting and gold prospecting mission.

The landslides blocked the cave entrance and caused it to flood with muddy water.

The group have not been heard from since, but one person who managed to reach safety reported at least one area of the cave was not underwater and specialist cave rescue divers from neighboring Thailand who had joined the operation said they had found pockets of air.

“I’m confident that they are still alive because there is still air in the cave,” said Metta Tham Rescue head of operations Kengkard Bongkawong.

He said that with water levels still rising after torrential rain forced rescuers to retreat Sunday night, they were pumping water out 24 hours a day and placing fixed ropes inside for rescuers to follow.

“The route is not complicated but the problem is the space. It’s so narrow that we have to crawl and tilt to pass through; also the rocks are really sharp,” said Kengkard.

Kengkard took part in the dive operation in 2018 to rescue 12 members of a youth football team and their coach after they had been trapped for more than two weeks in a flooded cave in Thailand’s Chiang Rai province.

The Metta Tham Rescue team was joined at the site Monday by Finnish diver Mikko Paasi, and Thai cave diver Norrased Palasing, also both veterans of the Tham Luang cave rescue in 2018.

The rescue turned into a huge international operation involving 10,000 specialists, from cave rescue and medical experts to Elon Musk, who had his engineers develop a mini rescue. submersible.

The mini sub was never used but two divers, both former Thai Navy SEALS, were killed in the operation.