Amelia Earhart disappeared 54 years ago, but people are still plumbing the depths of the South Seas in search of her lost plane.

Four experts from Oceaneering International, an underwater exploration firm, will join 14 others from The International Group for Historic Aircraft Recovery for a $400,000 expedition to try solving one of aviation history's biggest mysteries, the Houston Chronicle reported.The team will leave Hawaii in September for Nikumaroro, a South Pacific island 1,600 miles to the southwest where it is believed the pioneering aviator landed.

Earhart was on a round-the-world flight with navigator Fred Noonan when they vanished July 2, 1937.

TIGHAR, based in Wilmington, Del., theorizes Earhart and Noonan put down on a reef just off Nikumaroro after running low on fuel.

Evidence - an old metal navigator's case believed to be Noonan's - was discovered in 1989 that indicates the twin-engine plane sank off the island.