Costing The Earth about to descend into London's sewers
Professor Alice Roberts and Richard Aylard from Thames Water head into London's underground network of sewers to witness how raw sewage is pumped into the River Thames when as little as 2mm of rain falls on the capital.
And deep in the dark depths
Professor Alice Roberts and Producer Martin Poyntz-Roberts admire the sticky brown slime.
Man's effect on the environment, questioning accepted truths, challenging those in charge and…