M/V COURAGEOUS was originally built in Amal, Sweden, in 1956. She launched under the name M/V HOMBORSUND and operated under a Norwegian flag. She changed names a few times throughout her career, including after she was seized by U.S. authorities in 1985 for smuggling. She was sold to SunMar Inc, and the now M/V SUNMAR SEA was fully rebuilt forward of her engine room. She was ultimately acquired by the Air Force for use in a demonstration of a new weapons delivery system. The vessel was sunk off the coast of Okaloosa County as part of the exercise that took place on April 28, 2022. The blast broke the ship in two, causing the bow section to rotate a full 180 degrees. The two halves of the ship now rest side by side on a sandy seabed at a depth of 130 feet (39.5 meters). The twisted hull at the point of impact offers some interesting swim-throughs, although there is a high risk of entanglement. The ship's forward hold and superstructure offer penetration opportunities.