Scientists are working to develop an artificial blood that can be available for medics to use in an emergency when regular blood is not available.

To demonstrate, he lowers his prosthetic leg into the water; almost immediately, a school of tiger sharks appears. One of them rips off the prosthetic, releasing synthetic blood in the water.

Paul de Gelder lost his right hand and leg when a bull shark mauled him back in 2009 in Australia.

For decades, scientists have been trying to create artificial blood to alleviate shortages and prevent people from bleeding to death. But those efforts have been repeatedly frustrated by failure.