The Benwood, built in England in 1910, was owned by a Norwegian company and registered as a merchant marine freighter. She was 360 feet long with a 51-foot beam. She carried ore and was armed with 12 rifles, one four-inch gun, six depth charges, and 36 bombs.
On the night of April 9, 1942, the Benwood was on a routine voyage from Tampa, Florida, to Norfolk, Virginia, carrying a cargo of phosphate rock. Rumors of German U-boats in the area required her to travel completely blacked out with the Keys coastal lights three miles abeam. The ship Robert C. Tuttle, also blacked out, was traveling in the same area, bound for Atreco, Texas.
The bow of the Benwood collided with the port side of the Tuttle. The Tuttle was not in immediate danger, but the Benwood’s bow was crushed and taking on water. The captain turned her toward land and a half an hour later gave orders to abandon ship. The next day the keel was found to be broken and the ship declared a total loss.
Salvage began soon after the sinking and continued into the 1950s. It is believed that she was dynamited as a navigational hazard and was used by the U.S. Army for aerial target practice after World War II. This is one of the most popular shipwreck dives in the Keys.