Some of the world’s most amazing engineering projects and buildings now lie in ruins. But how and why? In this episode we hear about some once-great triumphs of marine engineering, now left to rust. A ship graveyard in Maryland has been colonised by wildlife. And we go inside a Cold War sub.<br /><br />Exploring ship graveyards, including Scapa Flow in Orkney, where German warships were scuttled after the First World War, and Mallows Bay, the home of 200 wrecks colonized by wildlife.
