Brighton Marina's main jetty is on the tilt, causing chaos for residents and shop owners. Dive engineers devise a plan involving air bags to fix it. Young diver Kai tells how fitness is key to the job and the dangers faced.
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. The dive team use everything at their disposal to try to free the propeller.
An oil tanker the size of two football pitches has new owners, and it must be inspected inch by inch before it's allowed to set sail. A team is called out to repair a vital piece of equipment on a cargo ferry.
A luxury floating hotel in London's docklands has a rusty bottom, the dive team are charged with making it shipshape once more. They then attempt to rescue a stricken cruise liner during a winter storm.
A mooring structure called a dolphin has brought the Isle of Wight ferries to a standstill. The whole ferry terminal must move to allow the dive team to repair the seaworn structure. But, they are hindered by a mountain of rubbish.
The team face one of their smallest but fiercest challenges, mussels. These small but deadly shellfish have blocked the pipes of a huge vessel, stalling it in dock. They must be blasted out of their hiding places to allow the ship to sail.
A missing lifeboat canister means a ferry can't sail, causing chaos for those that use the service for their daily commute. The divers search for it in near zero visibility and with local leisure cruisers posing a danger to the divers.
The dive team have been charged with clearing abandoned boats causing an eyesore and navigational hazard. What looks a tricky job takes a turn for the worse when disaster strikes, leaving the team stranded into the night.