Gotland-class

A Swedish diesel-electric attack submarine class notable as the world's first to enter service with Stirling-engine air-independent propulsion, allowing extended submerged endurance without snorkeling. One boat was leased to the US Navy for years of anti-submarine warfare training against its exceptionally quiet signature.

In service since 1996 · 1 operator countries

Compiled from public sources ·primary reference ↗ ·last verified 2026-07-02

200

m depth

6,000

nmi

1,600

crew

Procurement snapshot

Availability & export

Swedish export-licensed

ISP licensing; EU/Wassenaar controls.

Channel: Direct commercial / G2G

Fielded & proven

Limited · 1 operator

In service since 1996. Status: active · ~3 built.

Lifecycle cost (est.)

No public unit price to model from.

Interoperability

No standardised NATO calibre / datalink detected in public specs.

Derived guidance from public data — export regime by country of origin, lifecycle from the GAO ~30% acquisition rule. Verify eligibility, pricing and offsets with the manufacturer and your acquisition authority.

Full specifications

Firepower

Armament, payload and guidance.

Torpedo tubes Number of torpedo tubes (submarines and some surface ships).: 4

Stronger than 13% of submarines

Physical

Dimensions, weight and crew.

Length Overall length including gun/probe where applicable.: 60.4 m

Naval

Displacement, speed, endurance and diving depth.

Displacement Standard displacement in tonnes — the ship’s size class. Larger hulls carry more but cost more and are less agile.: 1,600 t
Submerged speed Maximum speed while submerged (submarines). Higher is faster underwater.: 20 kn

Stronger than 29% of submarines
Range Cruising range in nautical miles. Nuclear vessels are effectively unlimited (fuel-wise). Higher means more reach without replenishment.: 6,000 nmi

Bottom 6% of submarines
Test depth Maximum rated diving depth (submarines). Deeper is harder to detect and engage. Actual crush depth is classified.: 200 m

Bottom 5% of submarines
Complement Crew size. Fewer eases manning cost; more may indicate a larger, more capable platform.: 25
Propulsion plant Machinery type — nuclear reactor, gas turbine (COGAG), CODAG, diesel-electric, AIP.: Diesel-electric with Stirling air-independent propulsion

Program

Cost, production scale and operators.

Units built Total production run. Higher means proven manufacturing, mature logistics and spares availability.: 3

Stronger than 25% of submarines
Operator countries Number of countries operating the system. More operators means broader support ecosystem.: 1

Stronger than 39% of submarines

Specifications compiled from public Saab AB and reference sources ↗. Published defense figures are approximations — treat comparisons as directional. Last verified 2026-07-02.

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