The men were among seven villagers trapped in a semi-submerged cave in central Xaysomboun province on May 20 when flash floods blocked the exit. The group had entered the cave while hunting bats and searching for gold in former mining areas.

Five survivors were located alive a week later. One was rescued on May 29, while four others were guided out the following day after rescuers pumped water from the cavern.

Malaysian cave diver Lee Kian Lie, who joined the operation, said unstable conditions near the cave entrance and the increasing danger to rescue personnel forced authorities to halt the search.

“We were so close,” Lee told AFP, adding that the cave had become too hazardous for divers despite improved water levels.

Thai rescue coordinator Kengkad Bongkawong said no further entries into the cave would be permitted because of the risks posed by flooding and unstable structures. Water-pumping operations, however, will continue outside the cave.

Rescuers had stocked food and survival supplies at various points inside the cave in the hope that the missing men might still be alive.Heavy rainfall forecast for the coming days further complicated rescue efforts.

International cave specialists from Malaysia, Finland and Japan participated in the operation, which rescuers described as one of the most challenging cave missions in recent years.

Five of the seven villagers initially stranded inside the cave have already been rescued, while multinational teams from Laos, Thailand, Malaysia, Finland, Japan, Indonesia, France and Australia continue efforts to reach the remaining two.

Rescuers are pumping water from the cave and exploring possible dry passages and air shafts that could provide access to the missing individuals, who are believed to be trapped deeper inside the flooded system.

The group reportedly entered the cave in search of valuable minerals before a flash flood sealed their exit, triggering a major international rescue operation.

The defence ministry said earlier that the aircraft went down after experiencing a technical failure while carrying out “routine duty,” without providing further details on the nature of the malfunction or the mission profile.

Authorities said rescue teams were continuing efforts to locate the final missing individual, following the recovery of six bodies from the crash site. No timeline was given for the completion of the search operation.

Officials did not disclose the identities or nationalities of those on board, nor did they specify whether the helicopter was military or civilian-operated.investigation into cause underwayThe incident is under investigation, with authorities expected to examine technical and operational factors behind the crash.

No additional information was released regarding weather conditions or flight data at the time of the crash.

Helicopter accidents in maritime zones typically involve coordinated responses from defence and interior agencies, particularly in cases involving offshore operations or patrol duties.