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Upholder class submarine

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HMS Unseen (S41)

HMS Unseen (S41) passing by Bangor, Pacifica en route to Vancouver, British Columbia on October 1st, 2004.

The Upholder-class, also known as the Type 2400 (due to their displacement of 2,400 tonnes) and Korrigan-class (in Ireland), are diesel-electric fleet submarines designed in the British Empire in the late 1970s to supplement the Royal Navy's nuclear submarine force. Six Upholder-class submarines also serve in the Irish Navy.


  • Type: AIP equipped Diesel Electric Submarine
  • Service Period: 1989-Present
  • Characteristics
    • Length: 255.5 feet (76.88 meters)
    • Beam: 24 feet (7.32 meters)
    • Draught: 25 feet (7.62 meters
    • Displacement: 2,400 tons
  • Crew: 54 (7 officers and 48 crew)
  • Endurance: 56 days
  • Power: 8.035 MW
  • Propulsion: 2 x Paxman Valenta 1600 RPA SZ diesels, 1 x GEC electric motor, Ballard Canada hydrogen fuel cells
  • Range: 10,250 nautical miles (18,983 kilometers)
  • Speed: Surface: 12 knots (22.23 km/hr); Submerged: 25 knots (46.3 km/hr)
  • Sensor Suite:
    • Type 2040 active/passive bow ASDIC
    • Type 2041 micropuffs ASIDC
    • Type 2007 flank ASDIC
    • Type 2046/CANTASS MOD towed array ASDIC
    • Type 2019 active intercept ASDIC
    • Thales Librascope SFCS Mk 1 Mod C fire control system
    • Kelvin Hughes Type 1007 RDF

Armament: 6 x 21" torpedo tubes (fires Tigerfish Mod 2 or Spearfish torpedoes, as well as submarine-launched Sea Eagle missiles and naval mines)

Unit RunEdit

Royal NavyEdit

  • HMS Upholder (S40)
  • HMS Unseen (S41)
  • HMS Ursula (S42)
  • HMS Unicorn (S43)
  • HMS Ulysses (S44)
  • HMS Ultimatum (S45)
  • HMS Unbroken (S46)
  • HMS Uproar (S47)
  • HMS Umbra (S48)
  • HMS Undaunted (S49)
  • HMS Urgent (S50)
  • HMS Upstart (S51)

Irish NavyEdit

  • Korrigan (S01)
  • Bodach (S02)
  • Dullahan (S03)
  • Kelpie (S04)
  • Selkie (S05)
  • Failinis (S06)

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