The U.S. Navy just gave the world a glimpse of what the future of ocean surveillance looks like. In February 2026, the Navy test launched the Lightfish, an interceptor drone, from a partner nation’s ship for the first time in the Indian Ocean.1 Built by San Diego startup Seasats, this tiny solar-powered vessel can stay at sea for months on end with zero human crew. And the implications for global maritime security are massive.
What Is the Lightfish and Why Does It Matter
The Lightfish is a 305-pound drone designed for general-purpose activities such as surveying, research, and security patrols.2 It measures just 11.4 feet long and 3.4 feet wide, making it small enough to fit in the back of a pickup truck.
Lightfish offers six months of endurance and a range of 8,000 nautical miles on solar-electric power with a hybrid reserve.3 That makes it one of the most persistent unmanned surface vessels on the water today.
With the U.S. Navy, it will be used in missions to constantly gather intelligence through surveillance and reconnaissance along shorelines, in harbors, and even in the open ocean.2 Think port security, drug trafficking detection, illegal fishing patrols, and threat monitoring.
Here is a quick look at the key specs:
| Feature | Detail |
|---|---|
| Weight | 305 pounds |
| Length | 11.4 feet |
| Width | 3.4 feet |
| Top Speed | 5 knots (5.75 mph) |
| Endurance | Up to 6 months |
| Range | 8,000 nautical miles |
| Payload Capacity | 66 pounds |
| Cameras | 5 HD cameras |
| Power System | Solar-electric with methanol fuel cell |
| Crew Needed to Deploy | 1 to 2 people |
| Cost | Approximately $250,000 |
Each Lightfish costs about $250,000, and Seasats says it can comfortably pump out 250 of them per year.4 That price point is a fraction of traditional naval vessels, which makes this drone ideal for large-scale deployment.
Seasats Lightfish solar-powered unmanned surface vessel Navy ocean drone
How the Navy Tested It in the Indian Ocean
Commander Task Force 66 launched the Lightfish unmanned surface vessel from a Seychelles Coast Guard ship as part of Cutlass Express 2026, an exercise with the Seychelles Navy designed to test the drone’s abilities in open ocean with limited connection.1
The exercise ran from February 2 to 12, 2026. Exercise Cutlass Express 2026 brought together about 500 personnel from 19 nations.5
The U.S. Navy did not name the ship the Lightfish launched from, but Pentagon video footage shows the ship was the SCG auxiliary Saya De Malha (A605).1 That detail matters because it proves allied nations can deploy this drone from their own decks without heavy modifications.
“We are making history at Cutlass Express 2026 by demonstrating our enhanced warfighting skills through our robotic and unmanned capabilities alongside our maritime partners,”6 said Navy Lieutenant Bryna Loranger, operations officer for Commander Task Force 66.
Commander Task Force 66 is a fully drone task force that designs and tests new advanced technologies, including unmanned systems, artificial intelligence, and machine learning.6 The task force currently maintains 22 USVs.1
The Trans-Pacific Voyage That Proved Everything
Before its Navy debut in the Indian Ocean, the Lightfish had already earned its stripes with an incredible journey across the Pacific.
In June 2024, a Lightfish ASV completed a successful 2,500-mile voyage from San Diego to Hawaii.7 The team then sent it toward Japan, but over 2,300 miles into the follow-on mission, the small ASV encountered a typhoon with winds up to 80 mph and waves up to 18 feet, and communications eventually stopped.7
By analyzing the vehicle’s telemetry data, Seasats was able to determine the cause: an exhaust vent cover that did not seal properly and allowed water to enter the hull.7
Seasats did not quit. They fixed the flaw and tried again.
On July 30, 2025, Seasats announced that one of the company’s autonomous surface vessels had reached Japan after completing a fully autonomous trans-Pacific voyage.8 In total, the Lightfish traveled over 7,500 miles over 150 days, showcasing its exceptional reliability and endurance.8
And then came the unexpected twist. While operating approximately 330 miles northwest of Guam in June, the USV came within meters of the Chinese destroyer Nanchang.9 Seasats CEO Mike Flanigan put the encounter in sharp perspective: “We have a $250,000 USV coming within meters of a $900 million Chinese destroyer with close to 100 sailors on it.”9
Tech Inside the Lightfish Drone
What makes this vessel truly stand out is the technology packed into its compact body.
Lightfish is equipped with collision avoidance, onboard Artificial Intelligence, and GPS-denied navigation, five high-definition cameras, and redundant communication systems including LTE, Iridium SBD, Iridium Certus, and Starlink.2
The drone’s solar-electric power system has a supplemental built-in methanol fuel cell that can supply 11 or 28kWh of power.2 It is rugged and self-righting, operating in seas up to state 6.3 That means waves as high as 20 feet will not flip it over for good.
Lightfish is meant strictly for surveillance and reconnaissance, unlike other privately built USVs like the Cardona Marine Group’s Sea-Predator-7, which is equipped with munitions.2 This is not a weapon. It is the Navy’s eyes and ears.
The drone has a modular construction for easier maintenance and better customization, and most payloads can be swapped in minutes.2 Seasats claims that its browser-based controls allow anyone to learn to navigate this ASV within five days.2
The Bigger Picture for the Navy’s Unmanned Future
The Lightfish is just one piece of a much larger strategy.
The U.S. Navy is investing almost $7 billion in unmanned systems, with the small USV inventory numbering close to 500, and by 2045, about 45% of the surface force is expected to be unmanned systems.10
Seasats is riding that wave hard. In February 2026, the company announced a $20 million Series A financing led by Konvoy Ventures, bringing total funding past $40 million, with over $100 million in U.S. government contracts.11
That funding followed an $89 million ceiling SBIR Phase 3 IDIQ contract with the Navy to deliver Lightfish USVs to the Marine Corps.4 The company also received a $24 million APFIT award from the Department of War to accelerate procurement, production, and scaling of Seasats’ technologies.12
Beyond the Lightfish, Seasats has two other platforms in its lineup:
- Quickfish: A top speed over 35 knots, making it ideal for fast-response tactical operations.2 Its hull has an enclosed aerial vehicle launch bay for carrying aerial drones for defensive actions or strikes.13
- Heavyfish: Weighs 9,000 pounds with a 1,000-pound payload. It can also last six months at sea but requires a crane for launch.
Defense customers have used Lightfish for ISR, security, sub-sea communications, electronic warfare, and other missions, while commercial customers have used Lightfish to monitor wildlife, track harmful algal blooms, and create bathymetric maps.8
The oceans cover over 70% of our planet, and for too long, vast stretches of water have gone unwatched. Illegal fishing strips coastal nations of their livelihoods. Drug traffickers move freely through unmonitored shipping lanes. Piracy still haunts major trade routes in the Indian Ocean and Gulf of Aden. The Lightfish will not solve every problem, but at $250,000 a unit with six months of tireless patrol capability, it gives navies around the world a fighting chance to see what is really happening out there. As Rear Admiral Kelly Ward said, “We are leaning into this domain hand-in-hand with our partners, translating innovation into warfighting readiness and enhancing maritime security to protect freedom of navigation.”6 That is a promise worth watching. Drop your thoughts in the comments below on how you think the Lightfish will change maritime security.
