Cellula Robotics Ltd has achieved a significant new benchmark in subsea autonomy, demonstrating more than 2,000 kilometres of fully submerged endurance with its Envoy Autonomous Underwater Vehicle (AUV), powered by hydrogen fuel cell technology.

Announced from Burnaby, British Columbia on 21 April 2026, the mission exceeded the platform’s published performance specification and did so under conditions designed to reflect the realities of offshore operations rather than ideal straight-line transit.

That distinction matters. Instead of following a simple linear route, the Envoy AUV completed a complex underwater mission profile involving more than 4,000 turns and manoeuvres. Each movement increased energy demand compared with steady forward travel, making the result a stronger indication of usable subsea range in practical operating environments.

“The significance of this result is not just the distance travelled, but that it was achieved fully submerged in a mission profile that better reflects real subsea operations,” said Neil Manning, CEO of Cellula Robotics. “That is what makes the endurance meaningful for operators, with the potential for fewer recoveries, more continuous operations, and greater efficiency offshore.”

The milestone was achieved using hydrogen fuel cell technology developed with Infinity Fuel Cell and Hydrogen, Inc., whose system supports Envoy’s long-endurance capabilities beneath the surface.

For offshore operators, endurance is more than a technical statistic—it can directly affect cost, efficiency and continuity. Longer fully submerged missions can reduce the need for recoveries and relaunches, extend time on task, and make better use of vessel schedules where logistics, weather windows and intervention planning all shape project execution.

During the mission, Envoy remained deployed for 385 hours and travelled 2,023 kilometres submerged on hydrogen fuel cell power. The result highlights the growing potential for persistent, long-range AUV performance in genuine underwater operating contexts.

“We are proud to support a milestone that shows what hydrogen fuel cells can enable in real subsea operations,” said William Smith, President & CEO of Infinity Fuel Cell and Hydrogen, Inc. “This result highlights the role fuel cell technology can play in extending endurance, reducing intervention requirements, and supporting more capable long-range autonomous missions.”

It also reinforces hydrogen fuel cells as a practical enabling technology for extended autonomous subsea operations. While on mission, Envoy’s fuel cell system generated water as a by-product, underlining the lower-emission potential of fuel cell-powered subsea operations alongside their endurance advantages.

As offshore industries continue seeking longer-duration, lower-intervention autonomous solutions, the Envoy demonstration positions Cellula’s platform as a compelling option for missions where endurance directly influences operational continuity, offshore efficiency and the viability of sustained subsea deployment.