page_title: French submarine Mariotte
section_title: Construction and service
hierarchical_section_title: French submarine Mariotte / Construction and service
caption_attribution_description: English: Mariotte at anchor, Calais
context_page_description: The French submarine Mariotte was a submarine built for the French Navy prior to World War I. Intended to accompany the fleet, she was designed for high speed on the surface. Although the navy was unsatisfied with her performance on the surface, the boat had a higher underwater speed than any French submarine before or during the following 35 years. Mariotte was plagued with engine problems during her construction and the navy spent years fixing the various issues before finally commissioning her five years after beginning construction. During the war, she participated in the Dardanelles Campaign, but had to be scuttled after she became entangled in the cables of a minefield on her first attempt to penetrate the Dardanelles.
context_section_description: Mariotte, named after the physicist Edme Mariotte, was ordered from the Arsenal de Cherbourg on 31 December 1906. The boat was laid down on 30 March 1908 and launched on 2 February 1911 with only the starboard electric motor in place. The port electric motor was under repair at the time and was installed from 3 May to 21 June and a brief series of trials were conducted. The boat was refitted and further repairs were made to the port-side motor, although continuing problems with her propulsion system often immobilized Mariotte into 1912. She was able, however, to conduct diving, torpedo and underwater speed trials in August and September 1911. The boat was lightly damaged when the air heater of a Modèle 1909R torpedo exploded in its tube on 27 December. Her diesel engines, three years delayed by problems during factory testing, were installed from 1 March to 28 July 1912. They were judged satisfactory after the oil sump and the compressors were changed. After repeated breakdowns, Mariotte conducted her testing of the diesels from 23 October to 11 December and she was finally commissioned (armament définitif) on 5 February 1913 after a complete overhaul of her propulsion system.
  The boat was assigned to the 2nd Division (escadrille) of the Light Squadron of submarines on 16 January and she joined them at Calais on 11 February. Mariotte visited Brest on 20 February and was inspected by Rear Admiral Charles Eugène Favereau. During the inspection the oil-fired galley stove in the forecastle exploded, lightly burning two sailors. The boat was in Calais for the visit of King Christian X of Denmark later in the year.
  When World War I began in August 1914, Mariotte was transferred to the Mediterranean Squadron at Toulon where she patrolled off the coast of Provence. In July 1915, she was transferred to Mudros to attempt to penetrate the Dardanelles. After making a reconnaissance flight over the straits and having studied the reports of the British submarines that had successfully entered the Dardanelles, Lieutenant de vaisseau Auguste Farbre ordered his crew to cast off on the evening of 25 July. Escorted by the French destroyer Poignard to the mouth of the Dardanelles, she rounded Cape Helles on the surface, but dived to avoid being spotted by a searchlight about an hour later and attempted to pass underneath a minefield near Çanakkale. The boat became entangled in the cables and when she surfaced in an unsuccessful attempt to free herself, she was immediately engaged by a Turkish gun battery at close range. Mariotte could not submerge because her conning tower had been penetrated by shells so Farbre decided to scuttle the boat and surrender. The Turks ceased fire when he signaled his surrender and so his crew was able to destroy documents and equipment before opening the seacocks to sink the submarine. The wreck lies off Cape Nara near a Turkish naval base at a depth of 5 meters (16 ft).
caption: Mariotte at anchor, Calais, 1912–14
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