A video posted to YouTube on Monday shows hundreds of sharks devouring blue fish in an amazing feeding frenzy at Cape Lookout, North Carolina.

The rarely seen footage was captured by Donnie Griggs, who was out fishing with friends.  The men were walking along the beach when they witnessed more than 100 sharks attacking a school of blue fish. The fish apparently ran out of ocean while trying to escape the feeding frenzy as the sharks became beached in the fury. The shark attack lasted about five minutes.

“The presence of these sharks and large schools of fish is actually a sign of a very healthy ecosystem,” wrote Brian Recker, who posted the video.