The Snorkel (1958) took Hammer away from horror and into the area of the adult thriller. Mandy Miller plays the teenage child who believes that her stepfather killed her mother and passed it off as suicide as well as murdering her father before that, making ingenious use of a piece of breathing apparatus, the snorkel. Her persistence in suspecting the stepfather soon places her own life in danger. An initially promising thriller that ultimately lacks the required skill to bring it off. —Britmovie.co.uk
**1/2. Routine British thriller with at least two great scenes: the first describes van Eyck's pre Jaws shark-like attempt to drown Candy and, of course, the film's last scene. Just too bad that Hammer preferred a happy ending to a more disturbing and cruel one. Recommended to Hammer fans and nostalgic ones though.