mk 48

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United States Navy, SSN-774 Virginia-class of nuclear-powered attack submarines, build since 2000 as a replacements for the Los Angeles-class and complement to the very expensive Seawolf-class, 13 boats have been completed, out of a planned total of 48. 

Characteristics

Displacement: 7,900 metric tons (7,800 long tons)
Length: 377 ft (115 m)
Beam: 34 ft (10 m)
Propulsion: S9G reactor 40,000 shp (30,000 kW)
Speed: 25 knots (46 km/h) or over
Range: unlimited
Endurance: Only limited by food and maintenance requirements.
Test depth: +800 ft (240 m)
Complement: 135 (15:120)

Armament

12 × VLS (Tomahawk BGM-109) tubes
4 × 533 mm torpedo tubes (Mk-48 torpedo)
38 × torpedoes & missiles (torpedo room)

youtube

MK-48 gunner lays down some supressive fire with some BRRRRRRRT support.