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Modern Royal Navy (Britian) submarines. Starter set.
(1) Trafalgar class SSN ... currently 3 are active and 4 have been decommissioned
(2) Astute class SSN ... currently 3 are active and 4 are building.
One model has a Special Forces Dry Deck Sheleter (DDS).
(1) Vanguard class SSBN ... currently 4 are active.