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Sinking redundant warships is an effective way of testing new weapons and warships in as realistic a manner as possible. Whilst practice torpedoes are fired fairly frequently, they behave differently from warshots.
In order to meet environmental, health, and safety standards, ships have to be thoroughly cleaned so that all dangerous material and potential contaminants (such as asbestos, refrigerants etc.) are removed. In the event of the vessel becoming an artificial reef, escape exits also have to be created in the vessel, should divers encounter problems. It is now also common practice to remove pennant numbers and sink the warships anonymously, as a mark of respect to those who sailed in them.
In September 1819, the French engineer and Army artillery officer Henri-Joseph Paixhans wrote to the Ministry of the Navy to propose a fusing system to fire explosive shells at wooden warships, instead of the usual, solid round shots that were then in general naval use.[Notes 1] A commission studied the matter, and decided to build two Paixhans howitzers for trial purposes in 1822.
In 1824, the 80-gun ship of the line Pacificateur, made redundant by the Bourbon Restoration, was condemned. She was a Bucentaure class two-decker of the same type as the French flagship of the Battle of Trafalgar. The two prototypes were fired at her with devastating effect. This led to the adoption of the Paixhans gun in 1827. They were used to great effect at the Battle of San Juan de Ulua, to the interest of British and US observers, who announced the demise of wooden warships and the era of the ironclad.
- Agamemnon and Centurion
The British pre-dreadnought battleship HMS Agamemnon was converted to radio-control in 1920-21 and used for assessments of the damage that could be caused by aircraft and various calibres of guns. She was replaced in the role by the battleship Centurion in 1926.
After World War I ended, the US Navy and Army did live fire testing of attacking warships from the air. To get the testing as close to wartime conditions as possible, the USS Iowa was converted into a radio-controlled target ship, the first in United States naval history. A well known radio engineer, John Hays Hammond, Jr. developed the radio control gear for the Iowa. In 1923, the Iowa was sunk off the Pacific coast of Panama during fleet exercises, with members of Congress and the press attending, by the battleship Mississippi. In the early 1930s the US Navy got serious about remote control ships and fitted the destroyer Stoddert with an improved radio controls developed by Lieutenant Commander Boyd R. Alexander, a radio design officer, and the Naval Research Laboratory in Bellevue D.C. for further testing and evaluation. The evaluation proved so successful that the US Navy moved up their plans for radio controlled warships and in 1932 the obsolete battleship USS Utah and the destroyers Boggs and Kilty were converted to remote radio control.
- James Longstreet
A familiar sight for more than fifty years in Cape Cod Bay, Massachusetts was the SS James Longstreet. This World War II Liberty Ship was towed to a sandbar 3.5 miles (5.6 km) off shore in 1944 and was used for bombing practice through the Vietnam War.
- Operation Crossroads
Operation Crossroads was a 1946 series of US nuclear tests at Bikini Atoll that used 95 target ships. Some were obsolete US ships, such as the USS Nevada, others were ships surrendered by the Axis powers at the end of World War II, such as the German heavy cruiser Prinz Eugen and the Japanese battleship Nagato.
- Operation Deadlight
Operation Deadlight was the destruction of 116 surrendered, German U-boats between November 1945 and February 1946 by the Royal Navy. The submarines were sunk in deep water to the north west of Ireland. Some were scuttled with explosive charges and others sank accidentally in bad weather while under tow. The remainder were sunk by ships and aircraft, using rockets, bombs, depth charges and gunfire.
- HMAS Torrens
The Royal Australian Navy (RAN) sunk HMAS Torrens on June 14, 1999 with a Mk48 wire guided torpedo fired from the Collins class submarine HMAS Farncomb. Torrens was the last of six Australian River class destroyers, the others (Derwent, Parramatta, Stuart, Swan and Yarra) having been disposed of previously. Before the sinking Torrens had been thoroughly cleaned of all fuels, oils and potentially environmentally harmful substances. Her gun turret was donated to the South Western City of Albany. Torrens was then towed from Fleet Base West (HMAS Stirling) 90 kilometres (56 mi) out to sea, west of Perth. The submarine fired the torpedo at the stationary target from a submerged position over the horizon.
The sinking of Torrens was a display of firepower that provided some much needed positive publicity for the Collins class submarines, plagued by numerous technical problems and criticised over troubles with the combat system and noise reduction. Ric Shalders, commander of the Submarine Squadron said "the requirement of new submarine trials, the new need to test war-stock and the availability of the Torrens all came together to produce a very satisfactory result".
The US military term Sink Exercise (SINKEX) is used for the test of a weapons system usually involving a torpedo or missile attack of an unmanned target ship. The US Navy uses SINKEX to train its sailors on the usage of modern-day weapons.
- Such systems had been advocated earlier already by Napoleon himself, but the state of the technology of the 19th century made it an ineffective and dangerous practice.
- Artillery Jeff Kinard, Spencer C. (INT) Tucker p.235-236
- Neptunia 262, p. 49
- "Coast Battleship No. 4 (ex-USS Iowa, Battleship # 4) -- As a Target Ship, 1921-1923". Department of the Navy—Naval Historical Center. 2009-09-08. Retrieved 2009-09-08.
- "U.S. Navy Gets Crewless Ghost Fleet" Popular Science, February 1932
- Jeremy Olver (8 April 2001). "The Royal Navy Postwar: Type 12 Sinkings". www.btinternet.com. Archived from the original on 2006-12-12. Retrieved 2009-06-25.
- Pike, John (2005-09-01). "SINKEX - Sinking Exercise". GlobalSecurity.org. Retrieved 2009-03-24.
- Doehring, Thoralf (2008). "US Navy Ship Sinking Exercises (SINKEX)". Retrieved 2009-02-21.
- "Robot Warships" Popular Mechanics, July 1934, pp. 72-75 conversion of the Boggs to a radio controlled target ship