They don’t sip CRUcumbers at CRU or wait in line at Juice Bar, but they’re back every summer. A month ago, on Friday July 18, just in time to kick off Shark Week, a 1,653 pound great white shark pinged 50 miles east of Nantucket. Named “Contender,” he is the largest male white shark ever tagged by research group OCEARCH in the Western North Atlantic. While well offshore, his appearance is a timely reminder that sharks, too, summer on Nantucket.