Half of the group of boys trapped inside a cave in northern Thailand for two weeks have been been brought out, officials say. Rescuers decided to go ahead with the hazardous operation on Sunday because offears of rising waters. Divers are guiding the 12 boys and their coach through darkness and submerged passageways towards the mouth of the Tham Luang cave system. They are being rescued in groups. It is unclear how long the mission will take. However, it is moving much faster than officials had earlier predicted. Six boys are now reported to be above ground. The BBC’s Dan Johnson, who is at the scene, said doctors went to assess the boys on Saturday and decided on a priority list, sending the weakest out first.