The introduction of the Astute-class submarines has led to the gradual retirement of the Trafalgar-class fleet.

HMS Triumph (S93) sailed into HMNB Devonport flying a decommissioning pennant on the afternoon of Dec. 12, 2024, marking an end to its 33 years of service in the Royal Navy.

Trafalgar-Class Submarine. Military; HMS Triumph’s Final Port Call December 12, 2024, marked the end of an era of the proud history of the British Royal Navy’s submarine service.