Richly appointed, a glitterati champagne Cannes launch to an inebriated fanfare of stratospheric expectation, then unexpectedly in mid-journey an iceberg crash, an unsettling sinking feeling, followed by an agonizingly slow cascade into drowning horror. Compared to another mediocre superhero movie it might rank favourably, but a far cry from Tati or Hitchcock. Closer to a stylish 70s exploitation film.