A former Thai navy seal diver died on Friday while working to save 12 boys and their soccer coach trapped deep inside a flooded cave for the past 13 days, even as officials have now warned the window of opportunity to free the youngsters is "limited". The thirty eight year old was a former member of Thailand's elite navy SEAL unit and lost consciousness as he worked underwater in the cave complex, laying oxygen tanks along a potential exit route. His death highlights the risks for rescuers, and especially the boys, who have no scuba diving experience, if authorities decide they should attempt to swim out of the flooded cave. The boys, aged between 11 and 16, and their 25-year-old soccer coach were found alive 10 days after they went missing when flooding trapped them deep inside northern Thailand's Tham Luang cave complex on June 23rd. Rescuers are exploring all options to get the group out, but they've been been slowed by logistical issues including high water levels inside the cave and narrow, flooded passages which would require the boys, to dive alone. In addition, dwindling oxygen levels in the cave complex and weather forecasts predicting more heavy monsoon rains next week have added to the pressure on authorities to work out a rescue plan at the earliest.