No 4. Astute Class – UK
|Units built||7 planned|
|Weapons carried||Tomahawk cruise missiles; Harpoon anti-ship missiles in place of torpedoes6 x 533-mm bow tubes for 36 Spearfish torpedoesOR
Mines in place of torpedoes
The Astute class is the largest and most powerful nuclear attack submarines of the Royal Navy. It can carry a whopping 38 torpedoes at once and is home to a state-of-the-art pressurized water reactor. The class has been described as being even more complex than a space shuttle.
No 3. Seawolf Class – USA
|Speed||18 knots – Surfaced35 knots – Submerged|
|Weapons carried||8 x 660-mm torpedo tubes for 50 torpedoes or cruise missiles
Up to 100 mines in place of torpedoes or missiles
The Seawolf is a better and faster intended replacement for the Los Angeles class. Some budget constraints led to the cancelling of the full fledged production of the Seawolf class and only 3 could be completed.