Over 100 historic shipwrecks have been uncovered at a strategic maritime gateway — and researchers warn they may be at risk of fading away. The vessels were found on the seafloor of the Bay of Gibraltar, part of the narrow waterway linking the Atlantic Ocean and the Mediterranean Sea, by researchers with Project Herakles. The project, a joint venture between Spain’s University of Cádiz and the University of Granada, has been underway for six years. Researchers have identified 150 underwater archaeological sites — the majority of which are shipwrecks, according to The Guardian. The wrecks span centuries, from as early as the 5th century B.C. to World War II-era vessels. The vessels include 23 Roman ships, four medieval ships, and the engine and propeller of a plane from the 1930s, according to The Guardian. The findings were “not a chance discovery,” said Felipe Cerezo Andreo, a lecturer in archaeology at the University of Cádiz — and the discovery took years in the making.…