The SS Mauna Loa was a steel-hulled cargo ship constructed in 1919 at the Los Angeles Shipbuilding & Dry Dock Company in San Pedro, California. Originally named SS West Conob, she was part of the United States Shipping Board’s West series, designed for emergency wartime use during World War I. She measured approximately 5,899 gross register tons (GRT), with a length of 410 feet 1 inch and a beam of 54 feet 6 inches. Her power plant consisted of a single triple-expansion reciprocating steam engine driving a 17-foot 1-inch diameter screw propeller, enabling a service speed of around 11 knots. Her steel hull and deadweight tonnage of 8,600 DWT made her suitable for carrying substantial cargo loads. Initially operated by the Pacific Mail Steamship Company, West Conob completed multiple circumnavigations by 1921, sailing to destinations including Hong Kong, Honolulu, and South America. By 1925, she was allocated to Swayne & Hoyt Lines for South American routes, later sailing to New Zealand with wallboard cargo. In 1928, she was transferred to the Oceanic and Oriental Navigation Company under the Matson Navigation Company, and renamed Golden Eagle. In 1934, she was rebranded as Mauna Loa, after Hawaii’s prominent volcano, and entered service between Hawaii and the U.S. mainland, primarily on the Hawaii–California–East Coast route. During her service, Mauna Loa played a role in wartime logistics and responded to distress calls, notably assisting the windjammer Pacific Queen in 1936. With the outbreak of World War II, she was chartered by the U.S. Department of War to supply the Philippines but was diverted to Australia following the attack on Pearl Harbor. In early 1942, she participated in a convoy attempting to reinforce Timor against advancing Japanese forces. On February 19, 1942, during the Japanese bombing of Darwin, Mauna Loa was hit by two bombs that penetrated an open hatch, causing her to sink rapidly. Fortunately, her crew and passengers escaped injury, but she was among several ships lost in the attack, which resulted in approximately 250 casualties. Today, her wreck lies at a depth of 60 feet in Darwin Harbour, serving as a dive site. The remains include military trucks, Bren Gun Carriers, a Harley-Davidson motorcycle, and unexploded ammunition, preserving her historical significance as a wartime casualty and maritime artifact.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.