Hennepin is a shipwreck off the east coast of Lake Michigan, west of South Haven, Michigan. The ship was originally built in October 1888 and sank on August 18, 1927. Michigan Shipwreck Research Associates found the ship in 2006 and conducted several dives to assess the condition of the wreck. The wreck was listed on the National Register of Historic Places on February 1, 2008. She is significant as the first self-unloading bulk carrier. Career The ship was originally built as George H. Dyer by the firm of Wolf and Davidson in Milwaukee, Wisconsin. She was equipped with a steam engine at the time. The ship changed owners a few times, and in 1898, she was later Hennepin, after Louis Hennepin, an explorer of the Great Lakes. On June 27, 1901, the ship caught fire in Buffalo, New York. The fire damaged most of the upper deck and most of the machinery. The ship was sold to the Lake Shore Stone Company, who fitted her with a conveyor belt and made her a self-unloading ship. This was the world's first self-unloading ship, and it provided the paradigm for the many self-unloading vessels in use. The ship had a 1600-ton capacity. She was put to work loading stone from a quarry in Stone Haven, Wisconsin. Later, in 1923, she was purchased by Construction Materials Corporation and put to use hauling construction aggregate from a quarry on the Grand River to Chicago. The hull was wearing out and becoming unstable, so the ship was converted to a barge by removing her engine. She was hauled by the tugboats Ufasco in 1926 and Lotus in 1927. Loss On August 18, 1927, around 10:30 AM, Hennepin ran into a squall in the middle of Lake Michigan. The vessel had sprung a leak, and although the crew worked to save the ship, the pumps could not keep up with the volume of water coming in. The crew worked until 2:30 PM that afternoon, but they were unsuccessful, and the crew abandoned ship for the safety of the tugboat Lotus. Hennepin finally sank around 6:00 PM. Upon the return to port, Captain Ole Hansen said, "She died a hard death." Discovery Michigan Shipwreck Research Associates members were searching for the wreck of Northwest Orient Airlines Flight 2501 in 2006. In the process of mapping out sections of the lake, they discovered debris on the bottom that