The SS Gallia was a significant early 20th-century transatlantic ocean liner constructed in 1913 by the Société Nouvelle des Forges et Chantiers de la Méditerranée at La Seyne-sur-Mer. Designed for the Compagnie de Navigation Sud-Atlantique, Gallia was part of a trio of ships—including her sister ship Massilia and the Lutetia—built to serve mail and passenger routes between France and South America. She measured 574.2 feet (175.0 meters) in length, with a beam of 62.8 feet (19.1 meters) and a depth of 36.9 feet (11.2 meters). Her gross register tonnage was 14,966 GRT, and her net tonnage was 5,895 NRT. The vessel was equipped with wireless telegraphy, operated by the Compagnie générale radiotélégraphique (CGR). Gallia was capable of remarkable transatlantic speeds, completing voyages between Bordeaux and Rio de Janeiro in approximately 10 days, and to Buenos Aires in about 13 days. The ship's robust construction and technological features made her suitable for both passenger service and wartime conversion. During World War I, she was first converted into an armed merchant cruiser, armed with five 140 mm guns and four 47 mm guns, and later refitted in 1915 as a troopship. Her service as a troopship was marked by a tragic event. On October 3, 1916, Gallia departed unescorted from Toulon for Thessaloniki, carrying 1,650 French soldiers, 350 Serbian soldiers, and a crew of 350, along with artillery and ammunition. The following day, she was torpedoed and sunk by the German U-boat SM U-35, commanded by Lothar von Arnauld de la Perière, southwest of Sardinia. The explosion of ammunition aboard caused the ship to sink within 15 minutes, resulting in chaos, panic, and numerous casualties—over 1,000 lives lost, including soldiers and crew. The ship’s wireless was disabled by the explosion, hindering rescue efforts, but approximately 1,200 survivors were rescued by the French cruiser Châteaurenault. The sinking of SS Gallia stands as one of the deadliest maritime disasters involving a single French vessel during the First World War, and it remains a significant event in maritime history due to the scale of loss and its impact on wartime naval and troop transport.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.