I’ve always been told by family friends who live on the NC coast that you wouldn’t be in there if you knew what was swimming around your feet. One of my favorite beaches in northern CA has been closed to swimming numerous times I’ve been there due to shark sightings. Of course the water’s too cold there for much without a wetsuit anyway, so I suppose it didn’t matter all that much but it does cast a little pall over a day at the beach, lol.