Coastal Defenders: Season 1, Episode 2

1 - 2: Tugboat Tyre

In Britain's biggest port, cargo grinds to a halt as a tugboat picks up a mystery object in its propeller, leaving it out of action. It becomes man versus rubber in an epic battle to get the tug moving again.

The Coastal Defenders dive team use everything at their disposal, even a kitchen knife, to try and free the propeller from whatever has been dumped in the river.