"Repulse"s waterline belt of Krupp cemented armour measured thick amidships. Her gun turrets were thick with roofs were thick. As designed the high-tensile-steel decks ranged from in thickness. After the Battle of Jutland in 1916, while the ship was still completing, an extra inch of high-tensile steel was added on the main deck over the magazines. "Repulse" was fitted with a shallow anti-torpedo bulge integral to the hull which was intended to explode the torpedo before it hit the hull proper and vent the underwater explosion to the surface rather than into the ship.