HMCS Chicoutimi is a Victoria-class long-range hunter-killer (SSK) submarine of the Royal Canadian Navy, originally built and operated by the Royal Navy as HMS Upholder. Shortly after being handed over by the United Kingdom to Canada she was involved in a partial flooding incident which resulted in a fire at sea. The incident sparked a fierce debate over the value of the purchase of this group of second-hand vessels, as well as the handover inspection process. The subsequent investigation "determined the fire was caused by human, technical and operational factors, [and] the board cleared the commanding officer and crew of any blame." The submarine was repaired and entered Canadian service in 2015. Design and description As built the Upholder/Victoria class was designed as a replacement for the for use as hunter-killer and training subs. The submarines, which have a single-skinned, teardrop-shaped hull, displace surfaced and submerged. They are long overall with a beam of and a draught of . The submarines are powered by a one shaft diesel-electric system. They are equipped with two Paxman Valenta 1600 RPS SZ diesel engines each driving a GEC electric alternator with two 120-cell chloride batteries. The batteries have a 90-hour endurance at . The ship is propelled by a GEC dual armature electric motor turning a seven-blade fixed pitch propeller. They have a diesel capacity. This gives the subs a maximum speed of on the surface and submerged. They have a range of at and at snorting depth. The class has a reported dive depth of over . The Upholder/Victoria class are armed with six torpedo tubes. In British service, the submarines were equipped with 14 Tigerfish Mk 24 Mod 2 torpedoes and four UGM-84 Sub-Harpoon missiles. They could also be adapted for use as a minelayer. The submarines have Type 1007 radar and Type 2040, Type 2019, Type 2007 and Type 2046 sonar installed. The hull is fitted with elastomeric acoustic tiles to reduce acoustic signature. In British service the vessels had a complement of 7 officers and 40 ratings. Refits and Canadian alterations During the refit for Canadian service, the Sub-Harpoon and mine capabilities were removed and the submarines were equipped with the Lockheed Martin Librascope Submarine fire-control system (SFCS) to meet the operational requirements of the Canadian Navy. Components from the fire control system of the Oberon-class submarines were installed. This gave the submarines the ability to fire the Gould