Editing Upholder/Victoria-class submarine (section)

{{Short description|Class of diesel-electric attack submarine}}
{{Use British English|date=June 2017}}
{{Use dmy dates|date=February 2025}}
{|{{Infobox ship begin
}}
{{Infobox ship image
| Ship image = US Navy 111212-N-GU530-103 The Royal Canadian Navy long-range patrol submarine HMCS Victoria (SSK 876) arrives at Naval Base Kitsap-Bangor for a po.jpg
| Ship caption = {{HMCS|Victoria|SSK 876|6}} at US [[Naval Base Kitsap]], December 2011
}}
{{Infobox ship class overview
| Name = *''Upholder'' class (UK)
*''Victoria'' class (Canada)
| Builders = [[Vickers Shipbuilding and Engineering Ltd|VSEL, Ltd]] and [[Cammell Laird|Cammell Laird Co.]]
| Operators = * {{navy|United Kingdom}}
* {{navy|Canada}}
| Class before = {{sclass|Oberon|submarine|4}}
| Class after = 
| Subclasses = 
| Cost = 
| Built range = 
| In service range = 
| In commission range = * RN: 2 June 1990 – October 1994
* [[Canadian Forces Maritime Command|CFMC]]/[[Royal Canadian Navy|RCN]]: December 2000 – present
| Total ships building = 
| Total ships planned = 12
| Total ships completed = 4
| Total ships cancelled = 8
| Total ships active = 4
| Total ships laid up = 
| Total ships lost = 
| Total ships retired = 
| Total ships preserved = 
}}{{Infobox ship characteristics
| Hide header = 
| Header caption = 
| Ship type = [[Diesel-electric submarine]] (Hunter Killer [[SSK (hull classification symbol)|SSK]])
| Ship displacement = {{convert|2455|t|LT|abbr=on}}
| Ship length = {{convert|70.26|m|ftin|abbr=on}}
| Ship beam = {{convert|7.2|m|ftin|abbr=on}}
| Ship height = 
| Ship draught = {{convert|7.6|m|ftin|abbr=on}}
| Ship power = 
| Ship propulsion = * [[Diesel-electric transmission|Diesel-electric]] – 1 shaft
* 2 × [[Paxman Valenta]] {{convert|2,035|hp|MW|abbr=on}} 1600 RPA SZ diesels
* 1 × GEC electric motor (5&nbsp;MW)
| Ship speed = * {{convert|12|kn}} (surface)
* {{convert|20|kn}}+ (submerged)
| Ship range = * {{convert|8000|nmi|abbr=on}} at {{convert|8|kn|abbr=on}}
* {{convert|10000|nmi|abbr=on}} at [[submarine snorkel|snorkelling]] depth
| Ship endurance = 30 days
| Ship test depth = Over {{convert|656.17|ft|m|0|abbr=on}}
| Ship complement = 59
| Ship sensors = 
* [[Lockheed Martin]] CCS 876 combat system 
* Submarine-Launched Expendable Bathythermograph (SSXBT): [[Lockheed Martin]] Mk-8 Bathythermograph 
* [[Periscope]]:
* [[Thales Group]] CK-35/CH-85  
* [[Sonar]]:
** [[Lockheed Martin]] AN/BQQ-10(v)7 Sonar System 
** Type 2040 active/passive bow multibeam echo sounder with [[Lockheed Martin]] Echo Sounder Interface 
** [[Passive Underwater Fire Control Feasibility System|BQG-501 micropuffs]]
** Type 2007 flank
** [[Ultra Electronics]] Submarine Towed Array Sonar System (SubTASS)
** Type 2019 active intercept
* [[Fire-control system|Fire Control]]: Lockheed-Martin Librascope SFCS Mk 1 Mod C
* [[Radar]]: Kelvin Hughes KH-1007
| Ship EW = 
| Ship armament = 6 x {{convert|21|in|mm|abbr=on|0}} torpedo tubes (18x [[Mark 48]] Mod 7 AT torpedoes) 
| Ship armour = 
| Ship aircraft = 
| Ship aircraft facilities = 
| Ship notes = 
}}
|}

The '''''Upholder''/''Victoria''-class submarines''', also known as the '''Type 2400''' (due to their displacement of 2,400 tonnes), are a [[Ship classification|class]] of [[Diesel-electric transmission|diesel-electric]] [[submarine]]s built in the United Kingdom in the 1980s to supplement the [[nuclear submarine]]s in the [[Royal Navy Submarine Service|Submarine Service]] of the British [[Royal Navy]].

The boats were originally named the ''Upholder'' class, after the most renowned vessel of the former [[British U-class submarine|U class]]. Their British service life was short, with the vessels being [[Ship commissioning#Ship decommissioning|decommissioned]] in 1994. After an [[Upholder/Victoria-class submarine#Failed sale to Pakistan|unsuccessful bid]] to transfer these submarines to the [[Pakistan Navy]] in 1993–1994, the Canadian government eventually purchased the submarines and a suite of trainers from the Royal Navy for [[Canadian Forces Maritime Command]] (renamed to [[Royal Canadian Navy]] in 2011) to replace their decommissioned {{sclass|Oberon|submarine|2}}s in 1998.

In Canadian service, the submarines are classified as the ''Victoria'' class. These submarines initially suffered from serious electrical problems and were beset by mechanical operational incidents that limited their active service and the scope of their deployments. These problems have largely been overcome and the subs have achieved full operational capability.