The sinking of the U.S.S. Indianapolis is widely known as a shark story—but the truth is much more horrifying.

They hesitated at first, but the fishermen jumped into the water after realizing how calm the tiger sharks were, said Chelsea Black.

Several shark sightings along the East Coast have beachgoers on high alert. NBC News’ Maya Eaglin reports on what officials are doing to tackle safety concerns and explains what is influencing the surge in sightings.

If there is a suspected shark sighting, visitors will be asked to vacate the swimming area until the sighting is confirmed or not. In the case of a confirmed shark sighting, the water will be closed and will reopen when authorities determine it is safe to do so.

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A new shark alert system would empower authorities to quickly deploy warnings through mobile phone alert messages after a shark attack.