The Type 540 Gal-class submarine is a slightly modified variant of the German HDW Type 206 submarine class, modified for Israeli requirements. The Gal class submarines were built to Israeli specifications as the Vickers Type 540 at the Vickers shipyards in Barrow-in-Furness in the UK rather than Germany for political reasons. "Gal" was the name of the son of Abraham (Ivan) Dror, 3rd commander of the squadron and head of the project.