In the midst of World War II, Italian divers, operating under the shadow of night, slipped into Alexandria harbour and attached limpet mines to the hulls of two British behemoths, the HMS Valiant and HMS Queen Elizabeth. The resulting explosions sent shockwaves throughout the harbour, heavily damaging the battleships and rendering them inoperative for several months. This daring raid, carried out by a handful of Italian frogmen, was a remarkable feat of naval sabotage that highlighted the vulnerability of even the most formidable warships.