Tintin & The Lake of Sharks (1972)
Release: 1972, theatrical
Starring: Jacques Careuil, Georges Atlas, Jacques Balutin
Directed by: Raymond Leblanc
IMDB page: Link opens in a new window
Description: A sweep of forgeries is going through European museums, with the forgeries becoming more and more advanced. In Syldavia, Tintin and Haddock is getting ready to visit their friend Prof. Calculus who's been working on a secret project near a cursed lake.
PLEASE NOTE: While certain factors seem to point to there being an English release of this movie, I haven't actually been able to find any information about it.