Orca: US Navy future Extra-Large Unmanned Underwater Vehicle (XLUUV)
Flag The US Navy is progressing towards the aim of having extra-large unmanned underwater vehicles (XLUUVs) armed with cruise missiles, torpedoes, mines and smaller UUVs. These systems would complement larger nuclear-powered attack submarines and other anti-submarine platforms and potentially revolutionize undersea warfare. The deployment of such systems, at least in the West, is some years away. Russia and China are also working on XLUUV projects but are more secretive.

The XLUUV will operate across a broad range of roles. To do this it will be armed with up to twelve heavyweight tubes which could carry torpedoes for anti-submarine warfare (possibly including countering the Poseidon Intercontinental Nuclear-Powered Nuclear-Armed Autonomous Torpedo) and anti-ship strike, and/or cruise missiles for land attack. It will also carry large UUVs, sow mines, perform ISR (Intelligence, Surveillance and Reconnaissance), and mine countermeasures (MCM).


The first XLUUV class will be developed under the Orca Class XLUUV program. Lockheed Martin has received $43.2 million and Boeing $42.3 million to compete in the design phase. Orca is a two-phase competition with the design phase followed by a competitive production phase of up to nine vehicles starting in 2019. The Orca which is a stepping stone towards armed XLUUVs. The Orca Class will help develop the Concept of Operations (CONOPS) as well as furthering payload integration and adding mine warfare to the operational repertoire.
US Navy future Extra-Large Unmanned Underwater Vehicle (XLUUV) - Covert Shores

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Although no specifications are available, one graphic used by the US Navy to represent an armed future XLUUV is particularly revealing. It shows a craft with generally the same layout as the interim Orca class, with a payload module with bomb-bay like doors along the bottom. The payload bay contains three rows of four heavyweight torpedo tubes angled to fire down through the bomb bay doors. This makes the length of the payload bay about 10 meters, giving an indication of the overall size.


The US Navy’s Office of Naval Research built an Innovative Naval Prototype Large Displacement Unmanned Underwater Vehicle (LDUUV-INP) in 2015 to test Endurance, Autonomy (including Precision Navigation, Command, Control and Communications) and Payloads including Sensors:

US Navy future Extra-Large Unmanned Underwater Vehicle (XLUUV) - Covert Shores
US Navy graphic showing XLUUV concepts. The left is from Boeing, and the right from Lockheed Martin.

Boeing have also been building a series of experimental large displacement UUVs (LDUUVs) for around a decade with the Echo series. Several have been tested by the US Navy to aid UUV research, leading to Boeing’s funding for the Orca program. The largest of the series, the privately funded Echo-Voyager, is in a different league to existing UUVs, being 25 meters long with 8 ton payload compartment hull insert. It is almost certainly the largest UUV in the world, certainly publicly known.

1. 2. 3.

1 & 2. Boeing Echo Seeker 3. Boeing Echo Voyager*

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US Navy future Extra-Large Unmanned Underwater Vehicle (XLUUV) - Covert Shores
Boeing graphic of Echo Voyager with payload hull section.

Echo Voyager specifications
Length: 15.5 meters normal, 25.9 meters with payload insert
Beam: 2.6 meters
Height: 2.6 meters
Weight in Air: 50 tons (45,360 kg)
Depth: 3,000 meters
Speed: 8.0 kt maximum, 2.5-3 kt cruising
Range between recharges: ~150 nautical miles at nominal speed

Lockheed Martin
US Navy future Extra-Large Unmanned Underwater Vehicle (XLUUV) - Covert Shores
Lockheed Martin's design is more torpedo-like. The LM Orca design will be modular with an open architecture to allow multiple payload configurations.
US Navy future Extra-Large Unmanned Underwater Vehicle (XLUUV) - Covert Shores

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