What happens when a shark attacks a hagfish?
1 April 2013 Last updated at 12:47 BST
Hagfish are ancient creatures that live at the bottom of the ocean, scavenging for food.
When attacked by predators, they release a special slime to repel them. Scientists hope, one day, to make clothing out of the threads within this super-stretchy slime.
See what happens when a shark tries to bite a hagfish.
Footage courtesy of Museum of New Zealand Te Papa Tongarewa, from Hagfish predatory behaviour and slime defence mechanism.