The father of four who was killed by sharks while snorkeling solo off the coast of Israel in April was attacked by a school of dusky sharks, which are typically harmless to humans, according to researchers.

Barak Tzach, who lived near Tel Aviv with his family, was captured on video being dragged out to sea by a shiver of sharks — and he tried in vain to push the advancing predators away with his GoPro stick.

Witnesses at the beach in Hadera told local outlets that they heard him shouting for help before he was yanked under. Soon after, the water was stained red. 4

Months after the fatal attack, a group of scientists determined that Tzach’s death was the first known instance of the docile dusky shark ever killing a human being, according to a report published in the journal Etho

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