Juliet Marine to Construct Guardian Submersible USV (Learn More)

Juliet Marine Systems (JMS), unveiled plans to construct Guardian, a submersible unmanned surface vehicle (USV) that is a variation of JMS’ existing GHOST vessel and that offers a unique suite of capabilities in a single platform.

“We believe Guardian is the first surface vessel that is a fully submersible USV and one that will meet or exceed the USV mission needs of navies around the world at relatively low cost,” said Gregory Sancoff, President and CEO of JMS.

“We expect it to transform the way navies fulfill their operational requirements in maritime technology and provide greater capacity in littoral operations, with a host of multi-mission capabilities encompassing intelligence, surveillance and reconnaissance (ISR); mine hunting; and anti-swarm, short-range firepower.”

“There is no other platform like this in the world.”

Incorporating drag reduction technology tested and proved in the GHOST vessel and powered by a diesel powertrain with a hybrid electric drive, Guardian is intended for surface and subsurface operations, either manned or unmanned.

(See the Ghost vessel in Action! Courtesy of Juliet Marine and YouTube)

Guardian will extend 30 to 45 feet in length with a top speed of 35 knots when operating in surface mode with four feet of draft in the water.

The vessel, which can be manufactured in 18 to 24 months, is designed for easy maintenance with standard systems and can be easily transported via sea, air and land.

Guardian’s design can be reconfigured to meet a customer’s specifications and is designed to provide a smooth, stable ride to save the operator from heavy impact in rough seas.

Guardian is the latest product from JMS, an innovative marine technology company dedicated to advancing high-performance watercraft.

JMS spent eight years developing the technology encompassed in its GHOST small waterplane-area twin-hull (SWATH) vessel, whose control and stability for the safe transport of personnel and payloads has been tested in sea trials performed off the New England coast.

JMS has no U.S. Navy contract and is open to do business around the world.


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Juliet Marine Systems is dedicated to the rapid development and deployment of technologies that will enhance performance and safety in small vessels.

We employ an agile design process to develop advanced vessels and associated technologies much faster, and at greatly reduced cost, as compared to typical defense contractors or heavy industry.

Inspired by our team’s experience with medical devices, advanced robotics and venture capital start-ups, we have taken the concept of “thinking out of the box” and applied it across all facets of system research, design, development and production.

We are proud to bring a disruptive approach to one of the oldest technical professions, shipbuilding.