United Kingdom
Although the police have termed her mother's death a suicide, a teenage girl believes her step-father murdered her. - IMDb
| Delitto in tuta nera |  Italy |
| Hiipivä kuolema |  Finland |
| L'homme au masque de verre |  Canada |
| L'homme au masque de verre |  France |
| Masca de apă (poster title) |  Romania |
| La máscara submarina |  Spain |
| De Masker van Satan |  Netherlands |
| O dolofonos me tin kokkini maska (transliterated title) |  Greece |
| O Tubo da Morte |  Portugal |
| Der Schnorchel |  West Germany |
| Den smygande döden |  Sweden |
| The Snorkel |  Australia |
| The Snorkel | Canada |
| The Snorkel | United Kingdom |
| The Snorkel |  USA |
| Suicídio ou Assassinato? |  Brazil |
| Uverljivi alibi (literal title) |  Yugoslavia |
| Ο δολοφόνος με την κόκκινη μάσκα | Greece |
| Дихальна трубка (new title) |  Ukraine |
| Дыхательная трубка |  Soviet Union |
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Mandy Miller [13] | Candy Brown |
