“47 Meters Down” (*** out of four) was a harrowing thriller about two sisters (Claire Holt and Mandy Moore) on a vacation in Mexico who becone trapped in a shark observation cage when it sinks to the bottom of the ocean with several Great Whites circling nearby and their oxygen depleting as they struggle to get to the surface! Tense and unnerving thriller delivers the goods in style and makes the recent shark thriller “The Shallows” look like a school session by comparison. Good underwater photography and good performances.