Shallow Water Combat Submersible vs Sierra-class submarine

FORCETALLY

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Shallow Water Combat Submersible — licensed reference photograph

ASubmarines

Shallow Water Combat Submersible

Submersible , diver propulsion vehicle

Credit

CAPT Kate Dollof · Public domain · Resized · Public domain · Source ↗ · Modified

BSubmarines

Sierra-class submarine

Nuclear attack submarine

AI-generated illustration · Not a photograph

Credit

ForceTally · AI-generated illustration · Not a photograph · AI-generated · OpenAI output terms · Source ↗ · Modified

First system

Second system

At a glance

Side by side

Length comparisonOne shared metre scale

Shallow Water Combat SubmersibleLength

6.8 m

Length source ↗

Sierra-class submarineSierra II

110 m

Length source ↗

Lengths retain their source configuration and measurement scope.

Measured figures

Head to head

13 of 30 rows sourced on both sides

6.8m

110mSierra II

Length

All recorded figures & sources

6.8 m

Length

Single source

6.8 meters (22 ft)^[source]

107.16 m

Sierra I

Single source

Configuration

Details

Shallow Water Combat Submersible and Sierra-class submarine configuration
Specification	Shallow Water Combat Submersible	Sierra-class submarine
Range	—	Effectively unlimited, except by food supplies^[source]
Power	—	Sierra I & II: 1 × PWR , 190 MW ( HEU <= 45% ) 2 × 1,002 hp (747 kW) emergency motors 1 shaft, 2 spinners^[source]
Builders	Teledyne Brown Engineering^[source]	Krasnoye Sormovo^[source]
Operators	United States Navy Royal Navy (planned)^[source]	Soviet Navy Russian Navy^[source]
Preceded by

Cost	$383 million (program cost)^[source]	—

On order	7 USN, 3 RN^[source]	—

Building	2^[source]	—

Completed	2^[source]	4^[source]

Type	Submersible , diver propulsion vehicle^[source]	Nuclear attack submarine^[source]

Propulsion	Lithium-ion batteries powering electric motors^[source]	—

Test depth	>190 feet (58 m)^[source]	—

Sensors & processing systems	Inertial navigation system , high-frequency sonar for obstacle/mine avoidance and navigation, GPS^[source]	—

Armament	SEAL team personal weapons, limpet mines^[source]	Sierra I & II: 4 × 650 mm (26 in) torpedo tubes (only Sierra I) 4 × 530 mm (21 in) torpedo tubes ( 6 x Sierra II) SS-N-21 Sampson SLCM SS-N-15 Starfish anti-submarine weapon: 200 kt depth charge or 90 kg HE Type 40 torpedo SS-N-16 Stallion , 200 kt depth charge or 90 kg HE Type 40 torpedo Minelaying configuration : 42 mines instead of torpedoes^[source]