Following the seizure of yet another vessel after damage to undersea telecom cables, Nato is intensifying its investigation into what appears to be a growing campaign in the Baltic Sea. The Times' defence correspondent, George Grylls, delves into the story, meeting the sailors and divers working to uncover the truth beneath the waves.

The World in 10 is the Times' daily podcast dedicated to global security. Expert analysis of war, diplomatic relations and cyber security from The Times' foreign correspondents and military specialists. 

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