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CHIANG RAI: Tham Luang-Khun Nam Nang Non National Park in Chiang Rai&s Mae Sai district has officially opened Chamber 3 for visitors to get a glimpse of how the rescue mission for the 12 members of the "Wild Boar" football team and their coach, trapped in the cave for 18 days following a heavy downpour five years ago, took place.