The body of a 25-year-old man has been discovered at Faslane naval base.
Emergency services attended the base around 12.30pm on Thursday following the death.
A post-mortem will be carried out to establish the exact cause of death, which is currently being treated as unexplained.
A Police Scotland spokesperson said: "“Around 12.30pm on Thursday, 9 December, officers were called to Faslane naval base following the death of a 25-year-old man.
"A post mortem examination will be carried out to establish the exact cause of death, which is currently being treated as unexplained.
"A report will be submitted to the Procurator Fiscal."
The Clyde base is home to Britain's fleet of four Vanguard class submarines equipped with Trident nuclear missiles and five other Astute and Trafalgar class nuclear-powered attack submarines.
Faslane was first built and used as a base during World War Two and after negotiations with the US in the 1960s over the purchase of a Polaris missile system, four nuclear submarines were built at the naval base.
The location was chosen in the height of the Cold War due to its secluded location but also with deep water and easily navigable.
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