The oceans are vast and mysterious, covering 71% of our planet and containing all kinds of things that we have yet to discover, despite our best efforts to explore the deepest depths. Because not many ...

Seashells, seaweed and the odd piece of driftwood are all standard seaside finds. But a Jeep, an unexploded bomb, hundreds of plastic eggs or a fleet of brand-new motorbikes? That’s a different story.