What were the “breathing” tubes used by U-Boats to operate diesel engines while submerged called?

The “breathing” tubes used by U-Boats to operate diesel engines while submerged are referred to as snorkels. This technology allowed submarines to run their diesel engines while remaining mostly submerged, considerably enhancing their operational capability. The snorkel would extend above the water's surface, drawing in air needed for the diesel engines while keeping the submarine hidden from radar and surface detection. This innovation was crucial for U-Boats during World War II, as it allowed them to travel for longer periods underwater without needing to surface frequently, thereby maintaining the element of surprise against enemy ships.