Frantic surfers fled for their lives after suspected great white shark launched a savage attack on a seal just yards from show.
A trail of blood could clearly be seen in the water as horrified onlookers were ushered off the sand and the beach was closed.
A pair of desperate surfers, out on the ocean at Nauset beach in Orleans, America, frantically paddled to shore in the terrifying footage.
Nisi Schlanger told NBC New York : "I was just pulling my board and people were yelling 'get out of the water, get out of the water'. I thought I was dead."