The first diesel-powered submarine type in the Royal Navy is also the first to have a range that enables it to operate far from home.

Ship dataEdit

Endurance: 4632 km
Maximum speed: 15 kts

Armour Protection
Armour: 1

3 x 18in Mk VIII Torpedo. Ammo: 6 torpedoes

===Ships in class===

  • D.1
  • D.2
  • D.4
  • D.6
  • D.7
  • D.8

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