A Texas teen suffered a cardiac arrest at a rock climbing gym and died - but miraculously two hours later he was revived after continuous CPR. Sammy Berko, 16, was hailed as a 'literal miracle' by one of his doctors after suffering the heart attack in January.His parents Jennifer and Craig Berko watched as Sammy rang a bell to signal his distress, but they initially believed he was just fooling around.
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