Sewermen

The return of the programme following workers at one of the UK's biggest water companies, with a team tackling blocked toilets on match day at Blackburn Rovers' ground.With kick-off only a few hours away, Stu and Ian head into the sewer to break up and suck out the mass of fat, grease and unflushables clogging the pipework.

Waste Warriors James and Andy battle to clear a newly formed fatberg underneath a busy street in Manchester. It is a monstrous mass of waste and fat that is 50 metres in length.

In Cumbria, John and his army of engineers are midway through a mammoth plumbing job, replacing parts of an ageing monster underground pipeline.

Geoff and his elite squad of sewage cleaners must scour the pumps deep inside a holding tank at Southport Treatment works, to ensure the waste doesn't back up into people's homes.

Project director John and his team undertake a crucial test at a fresh water pipeline in the Lake District, and a garden in Rucorn, Cheshire, is being slowly submerged in sewage.

On-the-road engineers Steve and Mark are called to a block of flats where a pile of excrement has erupted out of a manhole onto the lawn, and the amount of waste is daunting.

In Cumbria, under an ordinary looking field lies a massive main trunk sewer that serves more than 100,000 residents in Carlisle. Cameras take a look inside.

In rural Cheshire, the water for a local community has to be shut off while engineers lay a new pipe, so clean water responder Eric is mobilised to provide an emergency supply.

In North Wales, engineer Luke and his team of plumbers are midway through a project to replace a problematic 2km section of pipe that has a history of large bursts.

Engineers go underground in Liverpool city centre to shift a massive concrete slab that is reducing the sewer flow. Rookie waste-water engineer Bunty unblocks a stinking drain.

Engineers race against time to find and fix a massive leak on the busy A6 road in Stockport, which has left thousands of customers with little or no water. Steve and Oz unblock an overflowing drain in a customer's garden, while Luke and his dogs try to sniff out a leak in a field in Cumbria.

Two miles off the coast of Blackpool, specialist divers are on an underwater mission to clean a massive submerged outfall pipe that disperses treated wastewater deep into the sea. Water tester Annette is out in harsh Cumbrian weather to perform vital checks on the water quality in her area and sewage supremos Mick and Ash race to the aid of a family whose backyard is swimming with sewage from a bunged-up manhole.