Why the Navy's New Autonomous Submarine Can't Decide If It's a Scout or a Weapon

Somewhere off the coast of Washington state, there is a 51-foot autonomous submarine called Orca. Boeing built it. The Navy paid for it. And depending on which program document you read, it's either a stealthy reconnaissance platform, a mine-layer, a torpedo carrier, or possibly all four, just not at the same time, and not particularly well yet.

Photo by Juan García on Pexels.

This is the Extra-Large Unmanned Undersea Vehicle program, better known as XLUUV. It has been called one of the most ambitious unmanned naval efforts in decades. It has also been called, less charitably, a very expensive proof-of-concept that nobody can agree on how to actually use.

Both things are true.

What Is the Orca, Exactly?

Boeing was awarded a contract for five Orca XLUUVs in 2019, worth roughly $43 million per vehicle, though that number has crept upward since. Each submarine is designed to operate autonomously over long distances, without a crew, surfacing periodically to receive new instructions via satellite. On paper, it's a compelling idea: deploy an unmanned sub ahead of a carrier strike group, let it map the battlespace, seed mines, maybe even launch torpedoes, all without risking a single sailor.

On paper.

In practice, the Orca has run into the kind of problems that tend to plague programs when the technology roadmap and the acquisition timeline were written in parallel by people who weren't talking to each other. The vehicles delivered to the Navy between 2022 and 2023 were accepted, but not yet capable of executing their full intended mission set. The Navy essentially took delivery of submarines it couldn't fully use yet, which is a procurement outcome that only makes sense if you've spent time inside the Pentagon.

The Identity Problem

Here's what makes the XLUUV situation interesting rather than just frustrating: the underlying tension isn't really about technical failure. Orca's propulsion works. Its autonomy software, while still maturing, is functional at a basic level. The deeper problem is doctrinal.

What does the Navy actually want an unmanned submarine to do?

If Orca is primarily a surveillance asset, it needs persistent loitering capability, low acoustic signature, and tight integration with fleet intelligence networks. If it's a weapons platform, the calculus shifts entirely, payload capacity matters more, and the legal and ethical questions around autonomous lethal action become very loud, very fast. Mine-laying is a third mission with its own specialized requirements. The program has tried to hold all of these roles simultaneously, and the result is a vehicle that's optimized for none of them.

This isn't unique to Orca. It's a recurring pattern in unmanned systems development: the military funds a platform before doctrine catches up, then spends years trying to retrofit a clear purpose onto hardware that was designed to be flexible enough to serve everyone and specific enough to satisfy no one.

graph TD
    A[XLUUV Program Start] --> B{Mission Defined?}
    B -->|Surveillance| C[Sensor Integration Priority]
    B -->|Weapons Platform| D[Payload & Legal Review]
    B -->|Mine Laying| E[Specialized Deployment Systems]
    B -->|All Three| F[Conflicted Requirements]
    F --> G[Delayed Capability Delivery]
    G --> H[Navy Accepts Incomplete Vehicles]

Why This Matters Beyond the Navy

The XLUUV program is worth watching for reasons that extend past submarine enthusiasts. Unmanned undersea vehicles are going to be a significant part of how major navies compete in the next few decades. China's PLAN has invested heavily in its own UUV portfolio, and the Indo-Pacific theater in particular puts a premium on long-range, persistent undersea presence that crewed submarines can't cheaply provide.

Getting this right matters. Which means getting the question right first.

A crewed submarine has a captain who can adapt to a shifting situation, read ambiguous sensor data, and make a judgment call. An autonomous sub operating in contested waters for weeks at a time, potentially beyond communication range, needs rules of engagement baked into its software, and that software needs to know what the mission actually is before it can execute it responsibly.

The Navy hasn't fully solved that problem yet. To be fair, neither has anyone else. But the Orca program has at least forced the conversation into the open in ways that purely conceptual discussions never quite manage.

The Honest Verdict

Orca isn't a failure. It's a first-generation capability that arrived faster than the doctrine needed to use it. That's uncomfortable, and it costs money, but it's not without precedent, early drone programs went through similar growing pains before the military figured out that Predators were better suited for persistent surveillance and strike than for the niche reconnaissance role they were originally designed to fill.

The question is whether the Navy will take this moment to nail down what it actually wants from autonomous undersea systems, or whether it will fund Orca's successors with the same ambiguous requirements and get the same ambiguous results.

Five submarines is a small fleet. The decisions made around this program will shape a much larger one. That's worth paying attention to, even if the submarines themselves are invisible at operating depth and nobody will ever get a good photo of one doing its job.

Which, honestly, is kind of the point.