The so-called Devil Boat, otherwise called the “Submarine in the Desert,” is actually the preserved sail of the submarine USS Hawkbill. The number 666 displayed on the sail was actually her hull number and has no connection to the occult. After being decommissioned in 2000, the monument was placed in the roadside Idaho Science Center to honor Arco’s long association with the Navy and the nuclear fleet in particular. Two small museums on the site feature Navy involvement in the area and artifacts related to scientific research.