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The dive team are called out to Brighton Marina's main jetty, which is on the tilt, causing chaos for residents and shop owners. Young diver Kai faces danger when the low tide threatens to bring the concrete jetty down on his head.

Meanwhile, an oil tanker the size of two football pitches must be inspected inch by inch before it's allowed to set sail, and a second team must repair a vital piece of equipment on a cargo ferry that is holding up the transport of vital supplies to a nearby island.