RV Petrel

RV Petrel was a privately-owned research vessel renowned for its deep-sea exploration and discovery of historically significant shipwrecks. Operated by Vulcan Inc., the company founded by the late Paul Allen, it conducted numerous expeditions across the Pacific Ocean, Atlantic Ocean, and Mediterranean Sea. The vessel's advanced technological suite enabled it to locate and document dozens of World War II-era warships, contributing substantially to maritime archaeology and naval history before being laid up in 2022.

History and acquisition

The vessel was originally constructed in 2003 as an offshore supply ship named *Seabed Worker* at the Halifax Shipyard in Canada. It was designed for demanding subsea operations, including supporting remotely operated vehicle (ROV) work for the oil and gas industry. In 2016, the ship was acquired by Vulcan Inc. and underwent an extensive, multimillion-dollar refit in Spain to transform it into a state-of-the-art research platform. This conversion prepared it for a new mission focused on underwater exploration and discovery, funded by Paul Allen's personal passion for history and exploration. The ship was renamed and officially launched on its new mission in early 2017, with its home port in Guam facilitating operations across the Western Pacific.

Design and specifications

The vessel was a robust, ice-classed ship with a length of 76.5 meters and a displacement of 3,180 long tons. Its diesel-electric propulsion system provided an operational endurance of 48 days and a cruising speed of 10.5 knots, suitable for long transits to remote survey sites. Key design features included a large working deck, a 30-ton-capacity A-frame for deploying heavy equipment, and a moonpool for launching subsea vehicles in calm conditions. The hull was strengthened for operations in challenging environments, and the ship featured dynamic positioning capabilities to hold station precisely over deep-sea targets. Accommodations were provided for a complement of 20 crew members and 10 scientists or technical staff.

Notable discoveries and expeditions

The vessel gained international acclaim for locating over 30 historically significant shipwrecks, predominantly from World War II. Its first major discovery in 2017 was the wreck of the Italian battleship Roma, sunk in 1943. In the Pacific Theater, it found the wreck of the USS Indianapolis (CA-35), famous for its tragic sinking after delivering components for the atomic bomb. Other monumental finds included the Japanese battleship Musashi, the USS Lexington (CV-2), the USS Juneau (CL-52), and the USS Hornet (CV-8). Expeditions also located the USS Wasp (CV-7) and the Japanese aircraft carrier Kaga, a veteran of the attack on Pearl Harbor and the Battle of Midway. In 2019, it discovered the wreck of the Japanese battleship Hiei and the USS Johnston (DD-557), one of the deepest warship wrecks ever found.

Operational history and crew

Following its refit, operations commenced in 2017 under the direction of Vulcan Inc.'s research team, led by director of subsea operations Robert Kraft. The crew comprised experienced merchant mariners, ROV pilots, sonar technicians, and data analysts. Key expeditions were often coordinated with naval historians from institutions like the Naval History and Heritage Command and involved international partnerships, such as work with the Royal Australian Navy. The ship conducted surveys from the Philippine Sea to the Solomon Islands, and in the Atlantic near the Strait of Gibraltar. Its final operational year was 2021, after which it was placed in lay-up in Scotland following a strategic shift by its operators.

Scientific equipment and capabilities

The vessel was equipped with a cutting-edge suite of oceanographic tools centered on a deep-diving, work-class remotely operated vehicle capable of operating at depths exceeding 6,000 meters. Primary survey systems included a multibeam echosounder and side-scan sonar for seafloor mapping. The ship also carried a sub-bottom profiler for imaging beneath the seabed and a sophisticated positioning system integrating GPS with acoustic transponder networks. The onboard mission control center featured real-time data visualization systems, high-definition cameras, and manipulator arms on the ROV for artifact recovery. This integrated technology package allowed for the detailed archaeological documentation of deep-water sites under the guidelines of the UNESCO Convention on the Protection of the Underwater Cultural Heritage.

Category:Research vessels Category:Maritime archaeology Category:Ships of the United States