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In Britain's biggest port, cargo grinds to a halt as a tugboat picks up a mystery object in its propeller. The Coastal Defenders dive team use everything at their disposal to try and free it.
First Air Date : Feb 27, 2023
Last Air date : Mar 10, 2023
Episode : 8 Episode
Season : 1 Season
Runtime: 26:14 minutes
Studio: BBC Two
Country: United Kingdom
Cast: Craig Parkinson
