This isn't as dreadful as I had feared - it is actually, partially, redeemed by some really excellent underwater photography - and a suitably satisfactory denouement. Halle Berry is a diver whose on/off boyfriend Olivier Martinez manages to coax her into taking an arrogant, wealthy, Brit and his son on a cruise to swim with sharks. The story is poor, predictable and very slow to develop. Far too much of the jeopardy is created not from the sharks but from the rather odious millionaire Brit; his son and the two leads' rather tiresome are they/aren't they relationship - and, it appears that…