A maintenance crew gets to work deep under the Channel, a team of teenagers braves the ultimate open water challenge, and a helicopter gets a little too close for comfort. Working with a helicopter crew, the crew of the THV Patricia need resupply the Wolf Rock lighthouse, 8 nautical miles off Land's End and marking an area of treacherous rocks. Landing a helicopter on board the ship in strong seas proves to be a hair-raising business. Meanwhile, after 20 years of service in a salty atmosphere, the Eurotunnel needs regular maintenance to keep it running. Engineers have a short window of time to work late at night while the tunnel is shut. Making their way through the Channel's chilly waters, a team of teenagers are attempting to swim the 21 miles to France.
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