Explorers on the Moon: Part 2 - S3-E12
Audio problem: When Calculus is telling Tintin via the radio that he, Haddock and the detectives are headed out to a nearby mountain range, he can be seen inside the tank as he is communicating with Tintin, but his mouth is never shown moving. (00:26:00)
Chosen answer: It is a pill that makes alcohol taste disgusting.