Unidentified Astute-class attack submarine (SSN) and an unidentified Vanguard-class ballistic missile submarine (SSBN).
Location: Loch Long, Firth of Clyde, Scotland.
Unidentified Astute-class attack submarine (SSN) and an unidentified Vanguard-class ballistic missile submarine (SSBN).
Location: Loch Long, Firth of Clyde, Scotland.