The oceans truly contain countless mysteries.

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.

From blood-red lakes to blacked-out islands, some of these discoveries have mystified scientists—while others have clearer ...

Unclaimed Baggage, the nation’s only retailer of lost luggage, has released its third annual “Found Report,” detailing the strangest, most common, and most valuable items discovered in America’s ...