Type-551 Ballistic Missile U-Boat
"For years, the 551 has been called 'terror on the seas', and for good reason. Very few other craft with the capability to detect you, tail you, and put enough cruise missiles to flatten a city on your deck."

Characteristics:
Type:   SSBN/SSGN (hull design SCB-304)[2]
Displacement:   
16,764 tonnes (16,499 long tons) surfaced[1][3]
18,750 tonnes (18,450 long tons) submerged[1]
Length:   560 ft (170 m)[1]
Beam:   42 ft (13 m)[1]
Draft:   35.5 ft (10.8 m) maximum[4]
Propulsion:   
1× S8G PWR nuclear reactor[1]
2× geared turbines; 60,000 shp (45 MW)[1] Fairbanks Morse auxiliary diesel[4]
1× 325 hp (242 kW) auxiliary motor
1 shaft with seven-bladed screw[4]
Speed:   
12 knots (22 km/h; 14 mph) surfaced[1]
20 knots (37 km/h; 23 mph) submerged (official)[1]
25 knots (46 km/h; 29 mph) submerged (reported)[1]
Range:   Limited only by food supplies
Test depth:   +800 ft (240 m)
Complement:   15 officers, 140 enlisted[1][3]
Sensors and
processing systems:   
BQQ-6 passive bow-mounted array[1] (which includes BQS-13 fire control array)[5]
BQR-19 navigation[1]
TB-16[1] or BQR-23 towed array[5]
BQR-25 conformal array[5]
Armament:   4 × 21 in (53 cm) Mark 68 torpedo tubes (Forward Compartment 4th level)
22 tubes, each with 7 Porsche-122 cruise missiles, totaling 154