The most important of all dive sites in the Similans, in reality part of Surin National Park, is Richelieu Rock, famous for its incomparable variety and abundance of marine life. Whale shark sightings are not uncommon here. However, since 1999, its once most beautiful dive site, Fantasy Reef, has been closed from all diving activities after its condition had significantly deteriorated. Park chiefs officially blame diving for the deterioration, while dive operators in the area claim that fishing boats, with or without permission, enter the national park during low season, when no dive operators are allowed in the national park.[citation needed] The national park also claims that the dive site suffered significant damage from the tsunami in 2004, and continues to keep the reef closed. Since only national park staff are allowed to dive Fantasy Reef, it has been impossible to confirm that statement.