The 140-strong crew aboard the Vanguard-class submarine spent months at sea as part of the UK’s latest nuclear deterrent patrol before returning to HM Naval Base Clyde.
Their mission forms part of the Continuous At Sea Deterrent (CASD), which has been in operation since 1969. Under CASD, at least one nuclear-armed ballistic missile submarine remains on patrol at sea, undetected, at all times.
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