Vanguard class submarines are the latest British nuclear powered strategic missile submarines (SSBNs).
| Sources | High | Low | |
|---|---|---|---|
| Length: | 1 | 491 feet 10 inches (149.9 m) | - |
| Beam: | 1 | 42 feet (12.8 m) | - |
| Displacement: | 2 | 15900 tons submerged | 15850 tons submerged |
| Surface Speed: | 1 | 20 knots (37 km/h) | - |
| Submerged Speed: | 2 | 25 knots (46 km/h) | |
| Crew: | 2 | 135 | 130 |
| Armament: | - | 16 tubes for Trident D5; 4 Torpedo tubes for Tigerfish or Spearfish torpedoes and RNSH (Royal Navy Sub-Harpoon) anti-ship missiles | |
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