[1] Tail [2] Propeller [3] Propeller's shaft [4] Low-pressure hull [5] Aft crew quarters [6] Aft feeding pump [7] Compressed air bottles [8] Exhaust compartment [9] Control room of combustion engines [10] Reduction gear [11] Main room of combustion engines [12] Salt water feeding pump [13] Steam turbine [14] Turbogenerator [15] Diesel generators [16] Engine room [17] Gearbox [18] Circulation pump [19] Electric motors [20] Bypass pump [21] Reactor [22] Turbocharging pump [23] Railing [24] Conning tower [25] Direction finder antenna [26] Radio [27] Surveillance periscope [28] Radar [29] Multifunction antenna [30] Snorkel [31] Attack periscope [32] Identification beacon [33] Bridge [34] Position light [35] Access to the bridge [36] Supply hatch [37] Operations center [38] Fore machinery control room [39] Attack control [40] Periscope [41] Radar [42] Sonar [43] Navigation room [44] Auxiliary operations center [45] Torpedo control center [46] Main ballast tank [47] Evacuation holes [48] Commander's cabin [49] Officers' room [50] Crew dining room [51] Batteries [52] Kitchen [53] Fridges [54] Crew kitchen [55] Potable water tanks [56] Officers' service area [57] Crew area [58] Materials depot [59] Signaling beacon [60] Torpedo room [61] Torpedo reloads [62] Torpedo tubes [63] High-pressure hull [64] Anchor well [65] Fore horizontal rudders [66] Access point to the sonar [67] Torpedo tube gates

When she entered service in September 1954, the USS Nautilus was the largest submarine ever built and the first one propelled by nuclear energy. Her hull resembled that of the German Type XXI submarines developed during the Second World War, since the United States had carried out trials with "teardrop" hulls and regarded them as potentially faster and more maneuverable. The construction of the USS Nautilus was very costly for that time, ascending to 40 millions of dollars, of which 25 corresponded to the nuclear reactor. This one provided heat to move two steam turbines geared to the corresponding shafts, and electric motors fed by batteries were installed as an auxiliary propulsion system.

Specifications of USS Nautilus submarine

Displacement
In surface: 3533 tonnes
Submerged: 4092 tonnes
Dimensions
Length: 97.5 meters (319 feet 10.57 inches)
Beam: 8.5 meters (27 feet 10.64 inches)
Draught: 7.9 meters (25 feet 11.01 inches)
Propulsion
Nuclear reactors: 1 x 70 megawatt
Steam turbines: 2 x 6700 horsepower
Electric motors: 2 x 325 horsepower
Maximum speed
In surface: 22 knots (40.7 kilometers/hour)
Submerged: 23 knots (42.6 kilometers/hour)
Maximum range
As built: 54363 nautical miles (100681 kilometers)
Operative depth
Regular: 120 meters (394 feet)
Maximum: 220 meters (722 feet)
Armament
Torpedo tubes: 6
Torpedo reloads: 18
Complement
11 officers and 100 petty officers and mariners

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