The ongoing rescue operation at Tham Luang cave has become the biggest rescue operation of its kind ever launched in Thailand with the participation of divers and other rescuers from several countries.
And the challenges facing them are a tough nut to crack as they have to race against time with the fate of the 13 boys and their coach hanging in the balance.
Two Australian divers said they spent three hours to get to Chamber 2 and had to get out because they needed new oxygen cylinders.
Two Japanese irrigation experts sent by Jica who have surveyed water draining operation have recommended the use of water jet to drain out the mud first which, they said, will help speed up the draining of water out of the cave.
17 rescuers from Peace Land Foundation of and other foundations who include cave divers, cave climbers have joined Seal team and cave divers from Britain.
Jessica Tate, spokesperson of the US team from USOACOM, told Thai PBS that the US team has been supporting the Thai rescue teams every day in diving and in search for alternative routes into the cave.
Meanwhile, about 300 oxygen cylinders were among a huge load of support equipment which arrived at Tham Luang cave on Sunday as frogmen from Navy Seal team and foreign divers tried to advance toward fork passage as they laid baseline.
The equipment were in flown by an Air Force C130 transport plane to Mae Fah Luang airport and transported by trucks to Tham Luang cave. Besides the 300 oxygen cylinders, there are 117 regulators, 2,000 chemical light sticks, 101 backpacks, 25 diving vests, 10 lead belts, four air compressors and others.