International rescuers team prepare to enter the cave where a young soccer team and their coach are trapped by flood waters in Mae Sai, Chiang Rai province, in northern Thailand Thursday, July 5, 2018 AP

Thai volunteers receive free massage at an outpost in the Tham Luang cave area as rescue operation continues for the 12 boys and their football team coach trapped in the cave at the Khun Nam Nang Non Forest Park in the Mae Sai district of Chiang Rai province on July 7, 2018 AFP

This undated handout photo taken recently and released by the Royal Thai Navy on July 7, 2018 shows a group of Thai Navy divers in Tham Long cave during rescue operations for the 12 boys and their football team coach trapped in the cave at Khun Nam Nang Non Forest Park in the Mae Sai district of Chiang Rai province AFP

This undated handout photo taken recently and released by the Royal Thai Navy on July 7, 2018 shows a group of Thai Navy divers in Tham Long cave during rescue operations for the 12 boys and their football team coach trapped in the cave at Khun Nam Nang Non Forest Park in the Mae Sai district of Chiang Rai province AFP

Rescue workers rest inside Tham Luang cave complex, where 12 schoolboys and their soccer coach are trapped inside a flooded cave, in the northern province of Chiang Rai, Thailand, July 7, 2018. REUTERS

Thai soldiers stand at the Tham Luang cave area as operations continue for the 12 boys and their coach trapped at the cave in Khun Nam Nang Non Forest Park in the Mae Sai district of Chiang Rai province on July 8, 2018 AFP

Ruamkatanyu Foundation rescuers are seen trying to find alternative entrance to the Tham Luang cave complex, where 12 boys and their soccer coach are trapped, in the northern province of Chiang Rai, Thailand, in this screen grab of a video taken July 5, 2018 REUTERS

This undated handout photo taken recently and released by the Royal Thai Navy on July 7, 2018 shows Thai Navy soldiers in the flooded Tham Luang cave during rescue operations for the 12 boys and their football team coach trapped in the cave at Khun Nam Nang Non Forest Park in the Mae Sai district of Chiang Rai province AFP

Thai soldiers try to connect water pipes that will help bypass water from entering a cave where 12 boys and their soccer coach have been trapped since June 23, in Mae Sai, Chiang Rai province, in northern Thailand Saturday, July 7, 2018 AP

Thai volunteers take a rest as rescue operation continues for the 12 boys and their football team coach trapped in Tham Luang cave at the Khun Nam Nang Non Forest Park in the Mae Sai district of Chiang Rai province on July 7, 2018 AFP