Christopher Cockerell invented the hovercraft (or Air Cushion Vehicle) by using a high-pressure jet of air to create a 'curtain' that lifted the vessel above the surface of the water or land. His early experiments involved two coffee tins and a hair dryer. The hovercraft was revolutionary because it removed the friction of the water, allowing for high-speed travel across varied terrain, including swamps, ice, and shallow water where traditional boats could not go. The first cross-channel hovercraft service between England and France began in 1968. While their use in commercial passenger travel has declined due to high fuel costs, they remain vital for military amphibious assaults, search and rescue operations, and scientific research in fragile environments like the Arctic, where they can travel without damaging the surface.