There will be four or five main characters based on real Thai and international volunteers. Mr Waller has recently interviewed Jim Warny, the Ireland-based Belgian cave diver who was responsible for bringing out Ekkapol Chanthawong, or Coach Ake, on the last day of the operation, and who was declared "a hero" by the Irish press. Mr Warny's experience will form a significant part of the film cave diver who was responsible for bringing out Ekkapol Chanthawong, or Coach Ake, on the last day of the operation, and who was declared "a hero" by the Irish press. Mr Warny's experience will form a significant part of the film