Aboard Ferdinand Magellan’s voyage of 1519 to 1522, the greatest expedition of the Age of Discovery and the first to successfully circumnavigate the globe, was a single Englishman. Andrew of Bristol was the master gunner on the flagship, Trinidad. He made it across the newly-minted Pacific Ocean and, in doing so, unknowingly traversed the deepest part of Earth’s seas, the Mariana Trench.