Rescue efforts for two remaining men believed to be trapped in a cave in central Laos have shifted to investigating deep vertical tunnels in the jungle.Seven men were trapped inside the cave in Xaisomboun province on May 19, after heavy rains caused flash flooding and landslides that blocked their exit.Over the weekend, search teams freed a group of five villagers, after they were found in a cavern late last week Rescue teams pumped water from flooded sections of the cave so that the men could escape.The first of the five men emerged from underground after he was fitted with diving equipment and a team helped him navigate through a flooded section of tunnel.The other four villagers then followed shortly afterwards, managing to free themselves after crews successfully drained the tunnel.Efforts have now turned to trying to locate another two villagers who are believed to be missing in a different part of the cave.Mikko Paasi, a Finnish cave diver who found the group of five men last week, says a hydrological team from Thailand who worked on the 2018 Thai cave rescue is arriving to help.After the five trapped men were rescued, they drew a map that points rescuers to a large air chamber, in a section of the cave beyond where they were rescued