Wreck diving explores sunken vehicles and ships, providing historical insights and supporting marine life. It includes non-penetration, limited penetration, and full penetration dives with varying risks. Specialized training is required, with different levels for each type of dive. Essential equipment includes knives, dive lights, drysuits, and spools. Top wreck diving destinations include Bermuda, Egypt, the Maldives, Chuuk Lagoon, the Philippines, and Turkey.