https://www.cbc.ca/news/canada/manitoba/falcon-lake-incident-book-anniversary-1.4121639
This has always been one of the more convincing cases for me. There’s physical evidence, a reliable story(and person), and that common theme of a strong sulphur smell being associated with whatever these things are.
Stefan has said that he regrets ever telling this story. Supposedly has never made any money of it.