Robot clean-up crews tackle litter on Europe’s seabed

A ship with a crane floats in the Mediterranean sun at a marina in Marseille, France. The crane whirs as it hauls waste from the seabed and, when the wire breaks the surface, the gripper at the end is clutching a rubber tyre covered in algae.As the day advances, rusted metal ship parts, fences and even heavy machinery emerge from under the waves and are dragged onto another vessel.