Three of Britain’s four nuclear deterrent submarines are out at sea in an "unusual" situation

[william]

It has been at least five years since this happened, according to former naval source

https://twitter.com/x/status/2115116400926720356

• Larisa Brown, Defence Editor at The Times, reports three of the UK's four Vanguard-class nuclear deterrent submarines are simultaneously at sea, a situation not seen in at least five years according to a former naval source.
• The Royal Navy has faced chronic submarine availability issues, including periods with no Astute-class attack subs deployed and extended patrol durations, prompting recent parliamentary scrutiny over High North readiness against Russian threats.
• The Ministry of Defence declined comment on the deployment; analysts view it as a potential sign of improving maintenance and fleet recovery, which would be noted by both UK allies and adversaries. Grok

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[Gaijin]

1 on it sway home from patrol.
1 just left on patrol.
1 on sea trials
1 in refit

It is far from unusual to have crossover for incoming and outgoing boats.