Penned by Jimmy Sangster (with nods to Alfred Hitchcock’s Shadow of a Doubt) and directed by Guy Green (A Patch of Blue), this elaborate and ingenious thriller pits murderous stepfather (Peter van Eyck) against his young stepdaughter (Mandy Miller) who is convinced he killed her parents, and is determined to prove it - before he makes her his next victim…
High Definition remaster
Original mono audio
Audio commentary with film historian Michael Brooke and author Johnny Mains
Undercover Killer: Inside ‘The Snorkel’ (2018, 21 mins): an analysis of the film and its production by Hammer expert Jonathan Rigby, BFI curator Josephine Botting, and cultural historian John J Johnston
Hammer’s Women: Betta St John (2018, 11 mins): film historian Kat Ellinger offers an appreciation of the American actress, singer, and dancer
Original script ending (10 mins): a reconstruction of the final scenes as they appear in Jimmy Sangster's original screenplay
Peter Allchorne and Hugh Harlow Remember ‘The Snorkel’ (2018, 8 mins): the Hammer production crew regulars recall making the film
Four-Note Fear (2018, 24 mins): an appreciation of composer Francis Chagrin’s score by David Huckvale, author of Hammer Film Scores and the Musical Avant-Garde
Original theatrical trailer
English subtitles for the deaf and hard-of-hearing
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