Sorry, this episode is no longer available to watch on Demand 5.
Find out why
First broadcast at 20:00 4 May 2012
We meet the bucket wheel excavators. Their mission is to peel back the surface of the earth with each turn of their colossal parts.
A showcase of the cutting-edge marine technology employed to satisfy the needs of modern living.
In London, a tunnel boring machine faces immense challenges as it takes on Britain's deepest tunnel.
Browse all shows
Channel 5 Broadcasting Ltd. 2014