The "high risk" operation to evacuate 12 Thailand footballers and their coach trapped in Tham Luang caves has concluded for the day and will resume in the next 10 to 20 hours, according to operation chief Narongsak Osottanakorn. Rescue workers will now need another 10 hours to prepare for the next phase of this unprecedented operation as they have used all the oxygen to evacuate four out of thirteen footballers from the flooded cave of Chiang Rai.