Wrecked ships lying deep under the stormy waters of one of the world's largest lakes are being invaded by colonies of weird-looking creatures.
Hundreds of historic stricken vessels in the muddy mass graveyard at the bottom of the turbulent Lake Erie in north-east US are becoming encrusted by layers of zebra and quagga mussels.
Before the alien species invasion began in the 1980s, the wooden ships were so well preserved in the lake’s cold, fresh water that wreck divers said they looked exactly as they would have when they first sank hundreds of years ago.
