Walker Subsea Engineering
Walker Subsea Engineering is a UK-based subsea engineering firm developing the D-SEA underwater battery pack in partnership with Volklec, enabling untethered ROV operations for offshore renewable energy and defense customers. The product is pre-commercial, with underwater trials scheduled for Q1 2026.
- Company typePrivate
- Founded2011
- HeadquartersWallsend, United Kingdom
- Headcount1–10
- GTM typeB2B
- OfferingHardware or Manufacturing
What Walker Subsea Engineering does
Walker Subsea Engineering is a UK-based, privately held subsea engineering firm founded in 2011 and headquartered in Wallsend, with a 1-10 employee team. The company is commercializing the D-SEA underwater battery pack, developed in partnership with UK battery manufacturer Volklec and announced on 2025-11-04. D-SEA is positioned as a first-to-market underwater battery solution built around Volklec's 21700-5000mAh energy cells, designed to free remotely operated vehicles (ROVs) from tethered surface support ships and enable greater vehicle autonomy for offshore renewable energy projects, ocean infrastructure inspection, and defense operations. Underwater trials are scheduled for Q1 2026, indicating the product is pre-commercial.
The company's business model centers on hardware sales of specialized underwater battery systems to two primary verticals — offshore renewable energy and defense and security — addressing the operational and cost constraints imposed by ROV tethering to surface vessels. Go-to-market is executed through a strategic co-development and distribution partnership with Volklec, supplemented by earned media in specialist trade publications (Electric & Hybrid Vehicle Technology International, Ocean News) and presence at subsea industry events such as Subsea Expo 2026 in Aberdeen. The company is led by Ashleigh Walker (Commercial Director) and Vahid Walker (Technical Director), and currently operates only in Europe (United Kingdom) despite targeting a $5.9 billion global underwater construction and defense market. No external funding rounds, revenue figures, patents, certifications, or named customers are disclosed in the available source material.
Walker Subsea Engineering firmographics
Firmographics- Name
- Walker Subsea Engineering
- Website
- https://walkersubsea.com
- Company type
- Private
- Founded year
- 2011
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Walker Subsea Engineering is a UK-based subsea engineering firm developing the D-SEA underwater battery pack in partnership with Volklec, enabling untethered ROV operations for offshore renewable energy and defense customers. The product is pre-commercial, with underwater trials scheduled for Q1 2026.
- Ownership category
- akta.pro rank
Walker Subsea Engineering industry classification
Industry- Product category
- Subsea Engineering / Underwater Power Systems
- NAICS
- Battery Manufacturing (33591)
- akta.pro primary industry
- Submarine Energy Storage & Power Distribution Manufacturing (Batteries, Switchboards, Converters) (IMAJAOAG)
Keywords
Where Walker Subsea Engineering is headquartered
LocationHeadquarters
- HQ city
- Wallsend
- HQ country
- United Kingdom
- HQ region
- Europe
Markets served
Walker Subsea Engineering business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Technology or R&D, Personnel, Marketing or Sales, Operations
Revenue model
- Underwater Battery Systems: Sale of specialized D-SEA underwater battery packs for ROVs targeting the underwater construction and defense market. The company collaborates with Volklec on development while commercializing the first-to-market untethered ROV battery solution.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels2 records
Walker Subsea Engineering product offering
Product offeringCore offering
Walker Subsea Engineering designs and manufactures underwater battery power systems for subsea robotic vehicles. Its core product, the D-SEA, is a swappable underwater battery pack for ROVs that enables vehicles operating down to 6,000 meters to be recharged without surfacing, using 21700-5000mAh cells from UK supplier Volklec and a wet-mate connector rated to 8,000m depth. The company is also developing the A-Flux product.
Product overview
Walker Subsea Engineering is an offshore technology specialist that has partnered with UK battery manufacturer Volklec to develop the D-SEA underwater battery pack, a first-to-market solution targeting the $5.9 billion global underwater construction and defense market. The company's primary offering enables greater autonomy for remotely operated vehicles by eliminating the need for tethered surface support ships.
Differentiator
Problem solved
Functional benefit
Brands
- D-SEA: Underwater battery pack designed to free remotely operated vehicles from tethered surface support ships, utilizing Volklec's 21700-5000mAh energy cells
Products and services
- D-SEA underwater battery pack A swappable underwater battery pack for ROVs (Remotely Operated Vehicles), enabling subsea vehicles operating at depths down to 6,000 meters to be recharged without surfacing the host vessel. Uses 21700-5000mAh lithium cells from UK supplier Volklec and incorporates a wet-mate connector rated to 8,000m depth. Marketed as the world's first swappable underwater battery pack for ROVs, carrying CIRCUIT ASSURED certification status.
Quantifiable outcome
- Underwater trials scheduled for Q1 2026
Companies that use Walker Subsea Engineering
Customer profileSegments2 records
Ideal customer profiles1 record
Walker Subsea Engineering technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature1 record
Walker Subsea Engineering partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- VolkleccoreUK battery manufacturer Volklec partnered with Walker Subsea to develop the D-SEA underwater battery pack, a first-to-market solution designed to free remotely operated vehicles from tethered surface support ships. The collaboration utilizes Volklec's 21700-5000mAh energy cells to enable greater vehicle autonomy for offshore renewable projects and ocean infrastructure protection, targeting the $5.9 billion global underwater construction and defense market. Underwater trials are scheduled for Q1 2026.
Scale indicators1 record
Recent moves5 records
Expansion highlights4 records
Walker Subsea Engineering competitors and assessment
Company assessmentBroad incumbents
- Sonardyne: Sonardyne develops subsea navigation, positioning, and communication systems used alongside AUVs and ROVs in offshore and defense markets. It is an adjacent incumbent whose customers overlap with Walker's target segments.
- Saab Seaeye: Saab Seaeye is a leading manufacturer of electric ROVs used across defense, offshore energy, and inspection. It is a key ROV OEM whose vehicles represent a natural integration target for Walker's untethered battery pack.
- Teledyne Marine: Teledyne Marine is a broad subsea technology incumbent offering sonars, imaging, navigation, and integrated unmanned marine platforms. It serves the same defense, offshore energy, and oceanographic customers Walker Subsea targets with D-SEA.
- Kongsberg Maritime: Kongsberg Maritime supplies autonomous underwater vehicles, subsea instrumentation, and naval systems globally. It overlaps with Walker Subsea's positioning in defense/AUV and offshore subsea markets, though at much greater scale and breadth.
Direct peers
- Subsea Tech: Subsea Tech manufactures underwater robotic and ROV systems used for inspection, surveillance, and intervention in marine environments. It is directly comparable as a subsea robotics/ROV specialist active in the same customer verticals as Walker Subsea.
- Saft (TotalEnergies): Saft designs and manufactures high-end lithium batteries for defense, space, and subsea applications, including submarine energy storage. It is the most directly comparable established subsea/defense battery manufacturer to Walker Subsea's D-SEA offering.
Emerging players
- Ocean Power Technologies: OPT develops autonomous ocean power and subsea surveillance platforms for defense and commercial markets. It overlaps thematically with Walker Subsea's positioning on untethered, autonomous subsea power.
- Blue Robotics: Blue Robotics builds low-cost underwater vehicles and subsea components for research, hobbyist, and light-commercial use. It is an emerging player that overlaps with Walker's ROV-enabling value proposition at a smaller, more accessible scale.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat3 records
Key risks5 records
Key highlights5 records
Customer concentration
Walker Subsea Engineering social profiles
Digital presenceWalker Subsea Engineering financial estimates
Financial estimateRevenue estimate
Valuation estimate
Walker Subsea Engineering leadership team
Management profileNumber of profiles
Profiles2 records
Walker Subsea Engineering funding detail
Funding detailFunding overview
Funding rounds1 record
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Walker Subsea Engineering M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Walker Subsea Engineering
What does Walker Subsea Engineering do?
Walker Subsea Engineering designs and manufactures underwater battery power systems for subsea robotic vehicles. Its core product, the D-SEA, is a swappable underwater battery pack for ROVs that enables vehicles operating down to 6,000 meters to be recharged without surfacing, using 21700-5000mAh cells from UK supplier Volklec and a wet-mate connector rated to 8,000m depth. The company is also developing the A-Flux product.
Is Walker Subsea Engineering a public or private company?
Walker Subsea Engineering is a private company. It is classified as family owned and is currently operating.
When was Walker Subsea Engineering founded?
Walker Subsea Engineering was founded in 2011. It employs 1 to 10 people.
Where is Walker Subsea Engineering based?
Walker Subsea Engineering is headquartered in Wallsend, United Kingdom, in the Europe region.
How does Walker Subsea Engineering make money?
One revenue line is on record: underwater Battery Systems.
Who are Walker Subsea Engineering's main competitors?
Broad incumbents on record are Sonardyne, Saab Seaeye, Teledyne Marine and Kongsberg Maritime. Direct peers are Subsea Tech and Saft (TotalEnergies). Emerging players are Ocean Power Technologies and Blue Robotics.
Does Walker Subsea Engineering have an API?
No public API is recorded for Walker Subsea Engineering.
What industry is Walker Subsea Engineering in?
Walker Subsea Engineering's product category is Subsea Engineering / Underwater Power Systems. Its primary akta.pro industry code is IMAJAOAG, Submarine Energy Storage & Power Distribution Manufacturing (Batteries, Switchboards, Converters). Its NAICS code is 33591.