The object was found on the seafloor off Florida, near the wreck of a Spanish treasure galleon.
A copper dome recovered from the bottom of the ocean may be the remains of a 17th-century primitive submarine known as a diving bell — one of the world's first, and the earliest ever found.
But new research suggests the object may actually be the top of an early diving bell lost during a salvage of the treasure ship a few years after it sank. These primitive submarines were sometimes used by divers in shallow waters; they are often open at the bottom and filled with air. It seems to have been made from two copper sheets, and there is a heavy rim studded with copper rivets all the way around it.
Sinclair and Kingsley noted that while there's no record of such a diving bell being used to salvage treasure from the Santa Margarita, the salvager Francisco Nuñez Melián — a Spaniard then based in Havana — described casting such a diving bell in his writings in 1625. Early diversWhile historical records don't mention that a diving bell was used on the Santa Margarita wreck, Sinclair and Kingsley note that the Spanish were early pioneers in this field. They suspect the device was based on a diving bell tested in 1606 by the inventor Jerónimo de Ayanz, whose design was later used to gather pearls in Venezuela.
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