Invasion of the giant Russian crabs

In the 1960s, Soviet scientists brought some red king crabs to the Arctic Ocean to farm them for meat (they’re as delicious as they are ugly). With classic Soviet efficiency, they lost a few. In 1976, one turned up in northern Norway. Now there are literally millions of them. They’re uninvited, unwelcome and seemingly unstoppable: some locals claim their voracious appetite for clams, fish eggs, seaweed and just about anything else is making a desert of the ocean floor.