Mr Mearns has located 29 major wrecks in a career spanning 35 years, including the 16th century ship The Esmeralda from Vasco da Gama’s fleet, and Ernest Shackleton’s Quest ship, which went down off ...

The astrolabe was found on a ship Esmeralda and could have been made somewhere between 1495 and 1500. Esmeralda was a Portuguese ship that reportedly sank in the Indian Ocean in 1503. The ship was ...