Sub Sightings: What Lurks Beneath, Occasionally Seen

LOOK: Submarine Sightings Off Port Everglades

They pop up mysteriously, without warning, just a few hundred yards offshore, sleek, gun-metal gray and menacing.

And for those who spot them for the first time while strolling on the sand or gazing from a beachfront balcony, the sight can be alarming.

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