You might want to look into the story of Lionel Crabb, an SAS frogman suspected of being killed while performing espionage against a soviet warship.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Lionel_Crabb" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Lionel_Crabb</a>