D class

===Description===
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 data===
Performance
Endurance: 4632 km
Maximum speed: 15 kts
Armour Protection
Armour: 1
Armament
3 x 18in Mk VIII Torpedo. Ammo: 6 torpedoes
===Ships in class===
* D.1
* D.2
* D.4
* D.6
* D.7
* D.8
Category:Royal Navy
Category:Ship type
Category:Submarine
Category:Fleet Submarine