time. amelia earhart disappeared in 1937 over the pacific during her landmark round-the-world flight. now her final distress calls may finally reveal what happened. here's dana jacobson.>> repr:or of aviator amelia earhart 81 years ago remains one of the greatest unsolved mysteries in american history. researchers revealed a new clue that may shed light on what happened to earhart and her navigator, fred noonan, as they tried to circle the globe. ve>> ery ebodyxpteecd a happy ending to the search because amelia was out there call for help and her calls were being heard. >> reporter: rick gillespie, who has researched earhart's doomed flight for 30 years, says he has proof earhart crash-landed on a remote south pacific island about 2,000 miles from hawaii and that she called for help for nearly a week before her plane was swept out to sea. gillespie has located documentation of distress signals sent in the days after earhart's disappearance, prompting the navy to launch a rescue...