Truk Lagoon, known as Chuuk - a group of tropical paradise islands in the Federal States of Micronesia - offers adrenaline-junky scuba divers a cool yet creepy underwater adventure in shark-infested Pacific waters while wreck diving the mysterious Ghost Fleet of Truk Lagoon. More than 50 major shipwrecks from WWII litter the seabed, making the undersea wonder of the world the best shipwreck diving destination on the globe. In 1944, Americans launched Operation Hailstone, which has been called the Japanese Pearl Harbor, and the bombardment lasted for three days. The attack wiped out 60 ships and 275 airplanes, sinking them to the bottom of the lagoon, so that now it is the biggest ship graveyard in the world. Most of the wrecks were left untouched for nearly 25 years since people feared setting off the thousands of sunken bombs. Many of the shipwrecks in the scuba diving paradise have full cargo holds full of fighter aircraft, tanks, bulldozers, railroad cars, motorcycles, torpedoes, mines, bombs, boxes of munitions, radios, thousands of various weapons, human remains, and other artifacts. More than 3,000 people were thought to have been killed and some divers swear that the wrecks in Truk Lagoon are haunted.