Large ship horns have long been used as signalling devices at sea, warning other vessels and announcing presence in ports and fog. The cruise ship version became a familiar sound online because of its deep, ceremonial tone compared to smaller boat horns. This recording captures that sustained blast in isolation, which is why creators reuse it for travel montages, harbour footage, and edits where a ship needs to feel present even off screen. Its length and echo make it instantly recognisable as maritime rather than road or rail.