MIAMI
04/06/2012 09:56 am ET | Updated Jun 06, 2012

Sub Sightings: What Lurks Beneath, Occasionally Seen

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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