Rudolf Diesel was a French-born German inventor and engineer. His Bavarian parents sent him back to their homeland of Germany where he received most of his education often at the top of his class. When Diesel went into the workforce, he studied the use of fuel. He invented a steam engine that ammonia vapor which exploded and almost killed him. Despite that notable failure, he later invented the diesel engine which is still widely used.
Diesel boarded a streamer boat in 1913 going from Belgium to London. However during the trip, Diesel disappeared with his cabin empty. He was found in the water and wasn't identified until his son came to see the body. Officials assumed he might of taken his own life, but some suspect that he might of been assassinated for an unknown military or business purpose.