the area—the only part that was recovered was the parachute tail plate, leading searchers to postulate that the weapon's parachute had deployed, and that the wind had carried it out to sea. On 22 January, the Air Force contacted the U.S. Navy for assistance. The Navy convened a Technical Advisory Group (TAG), chaired by Rear Admiral L. V. Swanson with Dr. John P. Craven and Captain Willard Franklyn Searle, to identify resources and skilled personnel that needed to be moved to Spain. The search for the fourth bomb was carried out by means of a novel mathematical method, Bayesian search theory, led by Craven. This method assigns probabilities to individual map grid squares, then updates these as the search progresses. Initial probability input is required for the grid squares, and these probabilities made use of the fact that a local fisherman, Francisco Simó Orts, popularly known since as ("Bomb Paco" or "Bomb Frankie"), witnessed the bomb entering the water at a certain location. Simó Orts was hired by the U.S. Air Force to assist in the search operation. The United States Navy assembled the following ships in response to the Air Force request for assistance: , a Navajo class fleet tug, arrived 27 January, first on-scene , flagship through January , found UQS-1 SONAR contact where Francisco Simo-Orts saw the bomb fall , mother ship for PC3B submersible , confirmed Pinnacles SONAR contact , served as a support ship for the submersibles , flagship 30 January – 15 March , flagship 15 March through April , This minesweeper of Minesweeper Division 85 out of Charleston, SC, supported during the search both submersibles ‘’Aluminaut’’ and ‘’Alvin’’ with Bob Ballard who controlled the submersibles and Jon Lindbergh who supported the Westinghouse ocean-bottom, side-scanning sonar (OBSS). That sonar array deployed beneath the USS Notable May have detected the nuclear bomb which was still aboard the B-52 bomber when it entered the water. , transported Aluminaut and Alvin to the search site , transported Aluminaut to Miami, Florida, after Palomares incident DSV Alvin Aluminaut PC-3B (Ocean Systems, Inc. submersible capable of searching to ) Deep Jeep (a Navy submersible capable of diving to ) CURV-I (Cable-Controlled Underwater Recovery Vehicle) , removed aircraft wreck debris from the search site , removed aircraft wreck debris from the search site , removed radioactive contaminated soil from Spain. Additionally, the aircraft carrier and various other units of the