Moored off Yemen’s Red Sea Coast is a rusting oil tanker, with a million barrels of crude aboard. 

It has been described as a 'floating bomb'.

After going without maintenance for the duration of Yemen’s four-year civil war, the UN says it is now at risk of exploding, potentially unleashing an environmental catastrophe on an historic scale.

But, with 80 million dollars’ worth of oil involved, Houthi rebels and the Yemeni government have disagreed on what is to be done.