Envoy, formerly Solus-LR, is a configurable fuel-cell or battery AUV for survey, inspection and sensor deployment. Cellula reports a DRDC-owned hydrogen vehicle completing 2,023 km over 385 hours fully submerged. The vendor overview specifies a 500 L flooded payload bay and 2,000 m depth, but the current specification table describes different mass/depth variants. Trial performance and catalogue limits require a defined energy, payload and vehicle configuration.
Technical detail
Core features
Fuel-cell or battery configurations with survey and inspection payload integration.
Vendor overview: 500 L flooded payload bay and 2,000 m depth; current table gives 1,000/3,000/6,000 m variants and conflicting mass figures.
Optional SAS, multibeam, sub-bottom profiler, camera, laser, magnetometer and environmental sensors; supplied payload qualification is mission-specific.
Company-reported DRDC-owned trial: 2,023 km, 385 hours fully submerged and over 4,000 manoeuvres; full payload/depth/acceptance conditions undisclosed.
Autonomous Systems
Sensing Isr
Use & integration
Recorded applications
Underwater infrastructure inspection and geophysical survey
Persistent undersea sensing and payload deployment
These describe the reviewed application scope, not confirmed deployments, released requirements or procurement eligibility.
Evidence of maturity
Long-duration trial reported for a DRDC-owned vehicle; no general fleet or payload acceptance follows from the disclosed range.
Commercial availability
Configured product and integration enquiry; endurance, depth, payload and support scope require confirmation.
Integration and verification
Readiness
A technology readiness level is not established by the reviewed public sources.
Configurable underwater survey, inspection and sensor payloads can support persistent undersea characterization and infrastructure awareness. Defence adoption and operational acceptance depend on the actual payload and buyer programme.
Envoy Long-Endurance Autonomous Underwater Vehicle may help teams working on Persistent uncrewed underwater surveillance by contributing to maritime and undersea operations, detection and situational awareness, and autonomous and uncrewed systems.
Envoy Long-Endurance Autonomous Underwater Vehicle may help teams working on Future submarine operational capability by contributing to maritime and undersea operations and detection and situational awareness.
This is a reviewed public-source assessment. It is not procurement eligibility, endorsement, customer interest, or classified demand.
Original sources 5 linked records
These records support this capability and its published Mission area and Defence need connections. A source count is not a count of independent confirmations.
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · defence applications
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · technicaldomainslugs
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · capability type
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · technology readiness level
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · technicaldomainslugs
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · commercial availability
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · name
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · defence applications
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · summary
The Envoy overview specifies a 500 L flooded payload bay and 2,000 m depth, 8.5 m length, 1 m diameter and 3,700 kg. The current table instead gives 1,000/3,000/6,000 m variants, 2,700 kg fuel-cell mass and 370 h/2,000 km; battery limits are up to 168 h/930 km. Conflicting mass/depth and range assumptions remain unresolved.
Supports: Capability · core features
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · commercial availability
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · summary
Source location: Product overview
The Envoy page describes a fuel-cell-powered underwater vehicle designed for long-endurance subsea operation.
Supports: Capability · name
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · defence applications
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · core features
The Envoy overview specifies a 500 L flooded payload bay and 2,000 m depth, 8.5 m length, 1 m diameter and 3,700 kg. The current table instead gives 1,000/3,000/6,000 m variants, 2,700 kg fuel-cell mass and 370 h/2,000 km; battery limits are up to 168 h/930 km. Conflicting mass/depth and range assumptions remain unresolved.
Supports: Capability · technical tags
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · technical tags
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · technical tags
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · core features
Envoy lists SAS,multibeam,sub-bottom profiler,camera,laser,magnetometer and environmental payload options; LARS/containers and communications use standard interfaces. Suction anchoring can extend low-power persistence. Naval functions may be customer/export limited.
Supports: Capability · core features
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · technicaldomainslugs
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · capability type
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · core features
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · technicaldomainslugs
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · maturity
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · summary
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Capability · maturity
The Envoy overview specifies a 500 L flooded payload bay and 2,000 m depth, 8.5 m length, 1 m diameter and 3,700 kg. The current table instead gives 1,000/3,000/6,000 m variants, 2,700 kg fuel-cell mass and 370 h/2,000 km; battery limits are up to 168 h/930 km. Conflicting mass/depth and range assumptions remain unresolved.
Supports: Capability · summary
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Capability · technical tags
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Mission area · Underwater ISR
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Mission area · Underwater ISR
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Mission area · Underwater ISR
Source location: Product overview
The Envoy page describes a fuel-cell-powered underwater vehicle designed for long-endurance subsea operation.
Supports: Mission area · Underwater ISR
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Mission area · Underwater ISR
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Mission area · Underwater ISR
Envoy is formerly Solus-LR; fuel-cell and battery configurations support geophysical survey, infrastructure inspection and configurable sensor/payload deployment.
Supports: Mission area · Underwater ISR
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Mission area · Underwater ISR
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Mission area · Underwater ISR
Envoy, formerly Solus-LR, is offered with hydrogen-fuel-cell or battery configurations. Vendor specifications include a 500 litre flooded payload bay and 2,000 metre operating depth; the published fuel-cell configuration claims 2,000 km and fifteen days. Range, stationary persistence and other vehicle-family specifications must not be conflated.
Supports: Defence need · Persistent uncrewed underwater surveillance
Source location: Product overview
The Envoy page describes a fuel-cell-powered underwater vehicle designed for long-endurance subsea operation.
Supports: Defence need · Future submarine operational capability
Source location: Product overview
The Envoy page describes a fuel-cell-powered underwater vehicle designed for long-endurance subsea operation.
Release datelined June 2, 2026 and posted June 3 says DRDC owns the tested Envoy, supported through a development contract. The hydrogen-powered trial covered 2,023 km over 385 hours fully submerged and included over 4,000 turns and manoeuvres. Payload, depth, full acceptance criteria and an independent test report are not provided.
Supports: Capability · maturity
Release datelined June 2, 2026 and posted June 3 says DRDC owns the tested Envoy, supported through a development contract. The hydrogen-powered trial covered 2,023 km over 385 hours fully submerged and included over 4,000 turns and manoeuvres. Payload, depth, full acceptance criteria and an independent test report are not provided.
Cellula reports Envoy travelled 2,023 km over 385 hours fully submerged, making more than 4,000 turns and manoeuvres, using an Infinity Fuel Cell system. This is a company-reported trial result for a particular configuration, not an unconditional endurance guarantee or independent fleet acceptance.
Supports: Capability · core features
Cellula reports Envoy travelled 2,023 km over 385 hours fully submerged, making more than 4,000 turns and manoeuvres, using an Infinity Fuel Cell system. This is a company-reported trial result for a particular configuration, not an unconditional endurance guarantee or independent fleet acceptance.
Supports: Defence need · Persistent uncrewed underwater surveillance
The project requires persistent sensor coverage in strategic northern, coastal and expeditionary areas and identifies sonar and acoustic systems among the relevant investment capabilities.
Supports: Defence need · Persistent uncrewed underwater surveillance
The official requirement calls for long-duration uncrewed vehicles that deploy and employ sensors to provide persistent coverage, with initial delivery anticipated in 2035/2036.
Supports: Defence need · Future submarine operational capability
Canada identifies long range, long endurance, under-ice operation, surveillance, deterrence, Arctic, Atlantic, and Pacific missions as public capability needs for the future fleet.
Public sources cited · Facts and assessments kept separate · Human review
Release datelined June 2, 2026 and posted June 3 says DRDC owns the tested Envoy, supported through a development contract. The hydrogen-powered trial covered 2,023 km over 385 hours fully submerged and included over 4,000 turns and manoeuvres. Payload, depth, full acceptance criteria and an independent test report are not provided.
