Call it a crash course in meditation: Moments before you throw yourself overboard where oceanic whitetip sharks carve slow circles around the boat, you’d better calm down. Slow the heart rate. because if you enter their world even slightly nervous, they will know. Like all sharks, their bag of tricks is splitting at the seams. Unlike those spoiled on the reefs, these sharks learned to survive in the desert that is the open sea. for starters, they hunt cooperatively. Don’t fear the two in sight — it’s the one edging up behind that tests your mettle.