WLRN News Corey Malcom, director of archaeology at the Mel Fisher Maritime Museum, recently played the boatswain's whistle from the Santa Margarita for the first time. Seven ships from the 1622 Spanish treasure fleet sank in a hurricane off the Keys. And it was their valuable cargo, like gold chains, silver bars and emeralds, that kept treasure hunters like Mel Fisher going for until they finally found it. Now the Mel Fisher Maritime Museum is taking a new look at that doomed voyage — and the people who were on it. Corey Malcom recently produced and recorded a sound no one has heard for almost 400 years.