The area was only opened up to foreign tourism in 1997 after negotiations between Myanmar and dive operators from Phuket in Thailand.[11][2] The archipelago's isolation is such that much of it has not even yet been thoroughly explored.[citation needed] The best diving conditions exist from December to April, with whale sharks and manta rays visiting from February to May. A five-star casino and golf resort, the Andaman Club now operates on Thahtay Kyun.