The Orca dates back to September 2017, when the Navy issued contracts worth about US$40 million each to Boeing, which had partnered earlier in the year with HII to build uncrewed submarines, and Lockheed Martin to develop competing designs for an extra-large unmanned undersea vehicle (XLUUV[a]) capable of autonomous operation on missions up to several months in duration.[2] In February 2019, the Navy awarded the Boeing/HII consortium a $43 million contract to begin work on building four of their XLUUVs, the design of which would be based on Boeing's earlier AUV Echo Voyager.[3] The following month, the Navy added a fifth vehicle to the order, with the total value of the contract reaching $274.4 million.[4] Orca deliveries were planned to be completed by the end of 2022.[4] The Navy took delivery of the first Orca in December, 2023.[5]
The basic Orca design shares a 51 feet (16 m) length with Echo Voyager, but the Orca will incorporate a more modular construction, primarily for the capability to be built with an additional payload module of up to 34 feet (10 m) long and a capacity of 8 tonnes (8,000 kg) for a total length of 85 feet (26 m).[3][6] The Navy specified the ability to adapt the Orca platform according to mission, with the ability for surveillance, submerged, surface, and electronic combat, and minesweeping.[6][2] The vessel will be powered by a hybrid diesel/lithium-ion battery system, which powers the Orca by battery while submerged and recharges the batteries with diesel generators while surfaced.[2] Maximum speed is 8 knots (15 km/h), though the typical service speed is about 3 knots (5.6 km/h), which gives the Orca a range of up to 6,500 miles (10,500 km) with an endurance of several months.[2][6]
^Naval Sea Systems Command considers an extra-large unmanned undersea vehicle to have a diameter of at least 54 inches (140 cm) and be capable of extended range and endurance[1]