Lake Superior-class Nuclear Attack Submarine

The Lake Superior-class Nuclear Attack Submarine was a class of submarine in the Canadian Forces Maritime Command. The design is based on the Trafalgar-class although it has a twenty foot hull stretch, a CANDU reactor, and an eight-cell Mk.45 vertical launching system.

In 1986, the Canadian government asked for tenders on new submarines, and stated that it would consider both nuclear and conventional designs, but would prefer nuclear subs.

The Lake Superior-class was originally conceived of as a class of up to twelve submarines although that number would soon be cut down to six submarines. In 1991, the number of submarines planned for further cut down to three which were to be complimented by six to eight cheaper diesel-electric submarines.

During the 2004 RIMPAC, the Lake Superior took down the American submarines Houston and Seawolf, the latter being more than a little embarassing for the USN as it had considered the Seawolf-class to be the world's best nuclear attack submarines.

In the 2020s, the Canadian government would begin a program to replace the Lake Superior-class with a new class of SSN, of which the choices were the Asakaze-class, Astute-class, Barracuda-class, Seawolf-class, and Virginia-class. On June 25, 2025, the Canadian government awarded the contract to BAe Systems for six Astute-class nuclear attack submarines (named the Kingsmill-class).

Specifications

 * Type: Nuclear Attack Submarine (Hull designation symbol SSN)
 * Builders: Canadian Submarine Consortium, Canada Shipbuilding Corporation
 * Characteristics
 * Length: 326 feet (99.37 meters)
 * Beam: 32 feet (9.76 meters)
 * Draught: 31 feet (9.45 meters)
 * Displacement: 5,820 tons
 * Crew: 130
 * Power: 16,500 shp
 * Range: Unlimited
 * Speed: 32 Knots
 * Propulsion
 * 1 x AECL CANDU Reactor
 * 2 x Western Electric steam turbines
 * 2 x WH Allen turbo generators; 3.2 MW
 * 2 x Paxman diesel alternators 2,800 shp (2.1 MW)
 * 1 x pump jet propulsion
 * 1 x motor for emergency drive
 * 1 x auxiliary retractable prop
 * Sensor Suite
 * Ferranti/Gresham Dowty DCB/DCG or BAE Systems SMCS data system
 * Type 2072 hull-mounted flank array passive sonar
 * Plessey Type 2020 or Marconi/Plessey Type 2074 hull-mounted active and passive search and attack sonar
 * Ferranti Type 2046 or Thales Underwater Systems 2076 towed array passive search sonar
 * Thomson Sintra Type 2019 PARIS or Thorn EMI 2082 passive intercept and ranging sonar
 * Marconi Type 2077 short range active classification sonar
 * Kelvin Hughes Type 1007 I band navigation radar
 * Pilkington Optronics CK34 search periscope
 * Pilkington Optronics CH84/CM010 attack periscope
 * Armament
 * 6 x 533mm torpedo tubes
 * 1 x 8-cell Mark 45 VLS

Unit Run

 * HMCS Lake Superior (SSN-876) - commissioned January 12, 1993
 * HMCS Lake Huron (SSN-877) - commissioned January 29, 1994
 * HMCS Lake Athabasca (SSN-878) - commissioned July 17, 1995