| Ship Name | Pennant No. |
|---|---|
| Superb | S109 |
| Sceptre | S104 |
| Displacement: | 4,900 tonnes (dived) |
|---|---|
| Length: | 82.9 m |
| Beam: | 9.8 m |
| Draught: | 8.5m |
| Complement: | 116 |
| Armament: | 5 tubes capable of firing: Spearfish Torpedoes RN Sub Harpoon Missiles Tomahawk Missiles |
| Sensors: | Sonar including Bow, Flank, Active Intercept and Towed Arrays Attack and Search Periscopes Collision avoidance radar Electronic warfare equipment |