Wasn’t there a guy years ago that developed a automobile motor than ran off water and he was allegedly murdered by the government?
The engine was a scam. The inventor claimed that the car ran on a tank of water, but it almost certainly ran on acetylene generated by calcium carbide reacting with water. After a brief demonstration, the inventor’s terms were the delivery of a large sum in cash in return for revealing the secret, with no recourse if the government was disappointed. When he was told that was not acceptable, he disappeared.