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Submarines: Repairs and Maintenance

Asked by Mr Richard HoldenConservativeMinistry of DefenceTabled Answered 2 December 2025UIN 93793

The question

To ask the Secretary of State for Defence, how many submarines have been unable to deploy due to maintenance overruns in each of the last five years; and what steps his Department is taking to reduce the potential impact of increased operational tempos on submarine availability.

Answered by Luke Pollard

The Ministry of Defence continues to work closely with the Submarine Delivery Agency and industry partners to minimise maintenance overruns and ensure that submarine availability remains aligned with operations


We are investing in infrastructure, work capacity and improved maintenance processes to mitigate the impact of increased operational tempos on the Fleet.

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