Where was the inventor Rudolf Diesel last seen alive, before his disappearance on 29/9/1913?

Rudolf Christian Karl Diesel (March 18th, 1858 – Sept 30th, 1913) was a German engineer and inventor. He was born in Paris and died in the English Channel. His best known invention is the Diesel engine.

He developed the idea of the compression ignition engine during the last decade of the 19th century, receiving a patent for the device on February 23rd, 1892 and building a functional prototype in early 1897 while working at the MAN plant at Augsburg. This 'Diesel engine' was named after him, having originally been known as the "oil engine".

On the evening of 29th September 1913, Diesel boarded the steamer "Dresden" in Antwerp on his way to Harwich, England. He was to attend a meeting of the Consolidated Diesel Manufacturing company in London, England. However, Diesel never arrived in England. His decomposing body was found a couple of days later by the seamen of the Dutch boat "Coertzen". The seamen gathered his belongings (pill case, wallet, I.D. card, pocketknife, eyeglass case) for identification and returned the body back into the sea. His personal belongings were identified by his son, Eugen.

There was, and remains, a great deal of mystery surrounding his death. It was officially judged a suicide, but many people believed (and still believe) that Diesel was murdered.