Dynamite fishing -- explosives used to kill fish so that they can be scooped from the surface -- is wrecking the reefs off Thailand's Lanta Island. These reefs took thousands of years to become coral-encrusted havens for fish and divers alike. It is but natural that such blasting has caused a wave of concern for the diving industry which has set off urgent calls for the protection of the nation's precious underwater ecosystem. "A big area of one dive site has been totally destroyed, and we are talking about hard coral which takes a long time to recover," said Patrick Catellani of Kon Tiki Diving.