The Submarine Heritage Centre - Upholder Class

Sponsorship Comments

"GEMC Ltd are pleased to sponsor the painting in recognition of the unique relationship between Canada and the United Kingdom"

Upholder Class Technical Facts:

HMS/M Upholder

- Pennant Number: S40.
- Builder: Vickers Shipbuilding and Engineering Limited.
- Yard Number: 1106.
- Ordered: 02.11.1983
- Laid Down: November 1986.
- Launched: 02.12.1986.
- Completed: 1989.

HMS/M Unseen

- Pennant Number: S41.
- Builder: Cammell Laird. Birkenhead (VSEL Ltd).
- Ordered: 02.01.1986
- Laid Down: January 1986.
- Launched: September 1989.
- Completed:1991.

HMS/M Ursula

- Pennant Number: S42.
- Builder: Cammell Laird. Birkenhead (VSEL Ltd).
- Ordered: 02.11.1983.
- Laid Down: August 1987.
- Completed:1992.

HMS/M Unicorn

- Pennant Number: S43.
- Builder: Cammell Laird. Birkenhead (VSEL Ltd).
- Ordered: 02.01.1986
- Laid Down: February 1989.
- Completed:1993.


- Dimensions: Length 230.6 ft, Breadth 25ft, Draught 17.7ft
- Displacement: Surface: 2,200 tons, Submerged: 2,455 tons
- Propulsion: 2 x Paxman Valenta 1600 RPA - 200SZ diesels. 2 x 1.4 GEC Altrnators. 1 GEC electric motor. 5,400 hp Single shaft.
- Speed: Surface: 12 knots, Submerged: 20 knots, Snorting: 12 knots.
- Range: 8,000 nautical miles @ 8 knots snorting.
- Armaments: 6 x 21 inch torpedo tubes (bow). Marconi Tigerfish Mk24 mod 2 (12 reloads). SSM McDonald-Douglas UGM -84 Sub Harpoon. Mines, Stonefish, carried in lieu of torpedoes.


Historical Facts:

The need for a new class of conventional submarine to replace the ageing Oberon class was made public in 1979, when the Type 2400 design was revealed.

Their operational role was reconnaissance in waters to shallow for SSN's , and to provide training. The initial requirement for twelve boats was cut to ten, and then the 1990 - 91 Defence Review cut the class to four. The cost of the four boats was £620 million (1987).

By this time, the Cold War was over, and their recon role was no longer needed, and in the hard financial climate of the day, it was decided that the Submarine Branch should be all nuclear. These fine boats were taken out of service in 1994, and laid up in Barrow Docks in the hope of finding a buyer.

Eventually, on July 2nd 1998, an agreement was reached between the governments of Great Britain and Canada for the lease and support of the four boats for a period of eight years at a cost of £254 million, with an option to purchase at a later date. The four boats have been successfully refitted and recommissioned into the Royal Canadian Navy as:

Upholder - Chicoutinu
Unseen - Victoria
Ursula - Corner Brook
Unicorn - Windsor


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