Overview
- HMS Vengeance returned to HMNB Clyde on Sunday, November 15, after an open-source estimate of a roughly 217-day patrol that would exceed the previous 205-day Royal Navy record.
- The Ministry of Defence declines to confirm patrol lengths or operational details, saying such information could harm security and capability.
- Defence reporting ties the longer patrols to maintenance shortfalls, including a multi-year overrun on HMS Vanguard’s deep refit and delayed work on HMS Victorious that have reduced available boats for relief.
- Published accounts describe gruelling conditions for the roughly 150 crew, who reportedly spent about 31 weeks at sea with limited family contact and tightly screened messages, though those human-impact details come from limited sources.
- The episode underlines a broader risk for the Continuous At-Sea Deterrent, which has run continuously since 1969, because the ageing Vanguard class must sustain longer patrols until Dreadnought-class boats arrive in the early 2030s.