Royal Navy Extends SSBN Patrol Durations Beyond Six Months (opex360.com)

• Vanguard-class patrols now exceed six months duration.
• Total reliance on SSBNs for UK nuclear deterrence.
• Sustaining CASD places high stress on legacy infrastructure.

"The Royal Navy has extended the deployment duration of its Vanguard-class nuclear-powered ballistic missile submarines (SSBNs) to over six months. With the UK's airborne nuclear deterrent retired, the Continuous At Sea Deterrent (CASD) capability now relies solely on these four aging vessels. Maintaining a constant presence at sea places significant operational strain on both the crews and the aging hulls. This extension underscores the critical reliance on the submarine-based leg of the nuclear triad while the transition to the future Dreadnought-class remains an ongoing strategic necessity for maintaining sovereignty."