A sea tractor is a motor vehicle designed to travel through shallow seawater, carrying passengers on a platform elevated above a submerged chassis. The sea tractor was most popular during the early 1930s, as a unique way to give scenic tours to patrons of waterfront hotels and resorts. In other applications, sea tractors were used simply as a ferry through shallow waters. The use of sea tractors has declined since, as boats, ferries, and other aquatic vessels often serve the same function much more efficiently and comfortably. Examples The hotel at Burgh Island operates a sea tractor, to carry hotel guests and other visitors the to the island at high tide, when the causeway connecting the island to the Devon mainland is submerged. The current tractor is the third one to be used at this location. A sea tractor is also used at South Sands Beach near Salcombe, Devon. The beach has no jetty or pier, and the South Sands Ferry therefore cannot reach dry land to pick up passengers. The sea tractor transports passengers to the ferry waiting a few metres out to sea. The United States Army Corps of Engineers operates a three-wheeled sea tractor called the Coastal Research Amphibious Buggy (CRAB). This vehicle consists of a wheeled tripod supporting an operating platform above ground level. It can move at on land and at a somewhat slower speed in water. It was built for scientific research on beach nourishment. Ballybunion Sea and Cliff Rescue, based at Ballybunion in the west of Ireland, operates a specially-constructed, tracked sea-tractor, used for launching and recovering the group's Atlantic 75-class lifeboat. Popular culture Books, TV, movies, and games Sea tractors have been featured on the famous child's TV Show Teletubbies. The Burgh Island sea tractor also appears as the method of transport between the mainland and the island in the 1941 Agatha Christie novel Evil Under the Sun. As a result, it also appears in the "Evil Under the Sun" (2001) episode of ITV's Agatha Christie's Poirot TV series, and features prominently in the 2007 adventure game Agatha Christie: Evil Under the Sun, both of which were adapted from the novel. In the game, the player can use a phone on the beach to summon the tractor to transport Poirot from the island to the village on the mainland. The second Burgh Island sea tractor features in the 1965 Dave Clark Five