Subctech
SubCtech GmbH is a Kiel, Germany-based manufacturer of subsea Li-Ion battery systems and autonomous OceanPack FerryBox monitoring instruments, serving offshore energy, marine research, AUV/ROV, and ocean racing customers globally. Acquired by Gabler Maschinenbau (Possehl Group) in August 2025.
- Company typePrivate
- Founded2009
- HeadquartersKiel, Germany
- Headcount—
- GTM typeB2B
- OfferingHardware or Manufacturing
What Subctech does
SubCtech GmbH is a Kiel, Germany-based designer and manufacturer of underwater power systems and autonomous ocean monitoring instruments, founded around 2009 and acquired by Gabler Maschinenbau GmbH (Possehl Group) in August 2025. The company operates two product lines: Ocean Power, comprising rechargeable Li-Ion battery packs (PowerPacks, Long-John, Big-Jim, Big-Jim XL) with titanium pressure housings rated to 6000m depth, SmartChargers, subsea batteries, AUV/ROV vehicle batteries, and a new 1–6 MWh Energy Storage System; and Ocean Monitoring, comprising the OceanPack family of autonomous underway measurement systems (RACK, CUBE, RACE, AQUA, BUOY) plus the NetDI controller, OceanView software, PowerLogger, subsea landers and frames, microplastic and plankton samplers, nutrient analyzers, and the OceanXpert pCO2/greenhouse-gas analyzer. All products are certified to API17F, MIL-STD, UN T38.3, and DNV-GL for offshore oil & gas and maritime use, and the pCO2 analyzers are SOCAT-compliant for climate research.
The business sells exclusively through direct sales and quote-based engagement to enterprise and scientific customers worldwide, with no public pricing. End markets are marine research institutes (GEOMAR, AWI, Fraunhofer, Max Planck), offshore energy operators and service companies (Equinor, Chevron, Allseas, Schlumberger, OneSubsea, Sonardyne), AUV/ROV manufacturers (Cellula Robotics), and high-profile ocean racing teams (Malizia-Seaexplorer, Team Holcim-PRB, Ocean Race fleets). The go-to-market is heavily augmented by participation in industry trade shows (Oceanology International, OTC Houston, ONS), scientific conferences, sailing sponsorships, and YouTube content. Revenue is not publicly disclosed. Following the August 2025 acquisition, SubCtech operates within the Gabler Ocean group alongside Develogic GmbH and north.io GmbH, with founder Stefan Marx continuing as Managing Director.
Subctech firmographics
Firmographics- Name
- Subctech
- Legal name
- SubCtech GmbH
- Website
- https://subctech.com
- Company type
- Private
- Founded year
- 2009
- Operating status
- Operating
- Short description
- SubCtech GmbH is a Kiel, Germany-based manufacturer of subsea Li-Ion battery systems and autonomous OceanPack FerryBox monitoring instruments, serving offshore energy, marine research, AUV/ROV, and ocean racing customers globally. Acquired by Gabler Maschinenbau (Possehl Group) in August 2025.
- Ownership category
- akta.pro rank
Subctech industry classification
Industry- Product category
- Subsea Batteries & Ocean Monitoring Equipment
- NAICS
- Ship Building and Repairing (336611), Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing (334511), Ship and Boat Building (33661)
- SIC
- Oil & Gas Field Machinery & Equipment (3533), Industrial Instruments For Measurement, Display, And Control (3823), Ship & Boat Building & Repairing (3730)
- akta.pro primary industry
- Marine Power Generation & Energy Storage (Generators, Batteries, UPS) (IMAJAJAB)
- akta.pro secondary industries
- Marine Sensors, Instrumentation & IoT (Condition Monitoring) (IMAJAJAI), Energy Storage Systems for Marine (Batteries, supercapacitors) (IMAJAHAJ)
Keywords
Where Subctech is headquartered
LocationHeadquarters
- HQ city
- Kiel
- HQ country
- Germany
- HQ region
- Europe
Offices3 records
Markets served
Subctech business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Operations, Supply Chain, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Ocean Power Products: Sale of Li-Ion batteries including subsea batteries, vehicle batteries (AUV/ROV), basic batteries, energy storage systems, custom batteries, and smart chargers. Products are certified according to API17F, MIL-STD, UN T38.3, DNV-GL standards
- Ocean Monitoring Products: Sale of autonomous underway measurement systems (OceanPack RACK, CUBE, RACE, AQUA), subsea monitoring systems, sensors, samplers, and monitoring components including pCO2 analyzers
- Customized Solutions: Bespoke battery and monitoring system development for specific customer requirements, engineering services
- Consulting Services: Technical consulting for maritime technology applications and system integration
Go-to-market motion1 record
Distribution channels2 records
Marketing channels6 records
Subctech product offering
Product offeringCore offering
SubCtech GmbH designs, manufactures and sells two integrated product lines for the marine and subsea markets: (1) Ocean Power — rechargeable Li-Ion battery packs, subsea batteries, vehicle batteries for AUVs/ROVs, scalable Energy Storage Systems (1–6 MWh), smart chargers and customised batteries, all with titanium pressure housings rated to 6000 m depth and certified to API17F, MIL-STD, UN T38.3 and DNV-GL; and (2) Ocean Monitoring — autonomous underway FerryBox measurement systems (OceanPack RACK, CUBE, RACE, AQUA, BUOY) plus sensors, samplers, subsea frames, landers and the NetDI controller for measuring pCO2, salinity, temperature, dissolved oxygen, pH, turbidity, nutrients and microplastics.
Product overview
SubCtech operates two main business units: Ocean Power and Ocean Monitoring. Ocean Power includes rechargeable Li-ion batteries branded as PowerPacks (Long-John, Big-Jim, Big-Jim XL series), SmartChargers, Subsea Batteries, Vehicle Batteries, Energy Storage Systems (ESS scalable 1-6 MWh), and Customized Batteries—all featuring titanium pressure housings for depths up to 6000m with certifications including API17F, MIL-STD, UN T38.3, DNV-GL. Ocean Monitoring comprises the OceanPack family of autonomous underway measurement systems (FerryBox): RACK (19-inch rack for larger vessels), CUBE (compact robust format), RACE (waterproof compact for racing yachts), and BUOY (subsea buoy), complemented by subsea frames and landers, PowerLogger and Subsea NetDI data loggers, Top-Box and NetDI Deck-Units, OceanView Software, Nutrient Analyzers, OceanXpert CO2 Analyzers, and autonomous samplers (Plankton Sampler, Microplastic Sampler). All systems are controlled via the NetDI controller with serial interfaces and support various sensors for pCO2, salinity, temperature, dissolved oxygen, pH, turbidity, and nutrients. The company was acquired by Gabler Maschinenbau (Possehl Group) in August 2025.
Differentiator
Problem solved
Functional benefit
Brands
- OceanPack: Family of autonomous underway measurement systems (FerryBox) for ocean monitoring including parameters such as pCO2, temperature, salinity, dissolved oxygen, and turbidity. Includes OceanPack RACK, CUBE, RACE, and AQUA variants.
- PowerPack
- SmartCharger
- PowerLogger
- NetDI
- OceanXpert
- gosubsea 3000
Products and services
- OceanPack RACK 19-inch rack-mounted autonomous underway measurement system (FerryBox) for environmental monitoring on larger vessels, with modular design and high-precision wet-chemical nutrient analysis capability.
- OceanPack CUBE
- OceanPack RACE Compact waterproof autonomous underway measuring system designed for racing yachts and high-speed vessels, featuring climate data acquisition at the ocean-atmosphere interface.
- OceanPack AQUA
- OceanPack BUOY
- NetDI Controller
- PowerLogger
- Subsea NetDI Logger
- Subsea Frames
- Lander
- OceanXpert CO2 Analyzer
- Nutrient Analyzers
- Plankton Sampler
- Microplastic Sampler Autonomous underway microplastic sampling system that catches smallest ocean surface microplastic particles through size fractioning (300-100-30 μm filters), operable standalone or with OceanPack systems, at high boat speeds and rough sea without crew requirement.
- PowerPacks (Li-ion Batteries) — Long-John, Big-Jim, Big-Jim XL series
- Subsea Batteries
- Vehicle Batteries (Li-Ion PowerPack format)
- Energy Storage System (ESS) High-performance, highly reliable and high-safety Li-Ion Energy Storage System for offshore subsea applications, scalable from 1 MWh to 6 MWh, with stainless steel tube housings for deep-sea conditions.
- SmartCharger
- Customised Batteries
Quantifiable outcome
- Battery systems operating at depths up to 6000m with titanium corrosion-free housings
- +2 more outcomes
Companies that use Subctech
Customer profileNamed customers12 records
Segments4 records
Ideal customer profiles4 records
Subctech technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration9 records
AI capability2 records
Feature7 records
Subctech partnerships and signals
Strategic signalPartnerships
Three partnerships are on record, tiered core and minor.
- Gabler Maschinenbau GmbH / Possehl GroupcoreGabler Maschinenbau GmbH, member of the Possehl Group, acquired SubCtech. SubCtech becomes part of Gabler Ocean group alongside Develogic GmbH and north.io GmbH. Stefan Marx continues as managing director. The acquisition combines SubCtech's underwater energy and ocean monitoring technology with Gabler's maritime machinery expertise.
- Mocean EnergycoreSubCtech and Mocean Energy signed a Memorandum of Understanding to develop customisable ocean power and monitoring solutions powered by wave, sun and battery technologies for subsea applications. The partnership combines Mocean's Blue X wave energy converter with SubCtech's battery and monitoring systems to deliver standalone low carbon subsea solutions globally.
- Maritime Cluster Northern GermanyminorLong-term partnership as member of the Maritime Cluster Northern Germany (MCND), supporting regional maritime technology ecosystem
Scale indicators5 records
Recent moves6 records
Expansion highlights6 records
Subctech competitors and assessment
Company assessmentDirect peers
- Saft (TotalEnergies): Saft is a leading manufacturer of advanced Li-ion batteries for marine, subsea, and offshore energy applications, including subsea-resident power systems—directly comparable to SubCtech's PowerPacks and Energy Storage Systems.
- Sea-Bird Scientific: Sea-Bird Scientific designs and manufactures oceanographic sensors and CTDs used in FerryBox-class underway monitoring—a direct competitor to SubCtech's OceanPack measurement systems for temperature, salinity, and dissolved oxygen.
- Aanderaa Data Instruments (Xylem): Aanderaa, part of Xylem, produces marine sensors and oceanographic instrumentation widely deployed on research vessels—directly comparable to SubCtech's OceanPack RACK/CUBE sensor suites.
- AML Oceanographic: AML Oceanographic manufactures CTDs and oceanographic sensors used for underway and profiling measurements, overlapping with SubCtech's NetDI-controlled sensor integrations.
- nke Instrumentation: nke Instrumentation produces oceanographic sensors and in-situ measurement platforms used in marine research and FerryBox applications—closely aligned with SubCtech's OceanPack family and NetDI ecosystem.
- Corvus Energy: Corvus Energy specializes in Li-ion energy storage systems for marine and offshore vessels, directly comparable to SubCtech's 1–6 MWh subsea Energy Storage System line.
Broad incumbents
- Teledyne Marine: Teledyne Marine is a large portfolio of marine instruments, batteries, sonars, and AUV systems; overlaps with SubCtech across oceanographic instrumentation, AUV power, and subsea monitoring, but at significantly greater scale and breadth.
- Kongsberg Maritime: Kongsberg Maritime is a global marine-technology incumbent offering AUVs, subsea sensors, and ocean instrumentation; competes with SubCtech in subsea monitoring and offshore battery systems but as part of a much broader portfolio.
- Kongsberg Discovery: Kongsberg Discovery offers subsea sensor systems and AUV platforms used in marine research and offshore energy—adjacent to SubCtech's subsea monitoring and battery business.
Others
- Develogic GmbH: Subsea instrumentation specialist now part of Gabler Ocean alongside SubCtech; develops subsea sensor and data systems that complement SubCtech's monitoring portfolio within the same parent group.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Subctech social profiles
Digital presenceSubctech compliance and trust
Trust signalCompliance5 records
Subctech financial estimates
Financial estimateRevenue estimate
Valuation estimate
Subctech leadership team
Management profileNumber of profiles
Profiles2 records
Subctech funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Subctech 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 Subctech
What does Subctech do?
SubCtech GmbH designs, manufactures and sells two integrated product lines for the marine and subsea markets: (1) Ocean Power — rechargeable Li-Ion battery packs, subsea batteries, vehicle batteries for AUVs/ROVs, scalable Energy Storage Systems (1–6 MWh), smart chargers and customised batteries, all with titanium pressure housings rated to 6000 m depth and certified to API17F, MIL-STD, UN T38.3 and DNV-GL; and (2) Ocean Monitoring — autonomous underway FerryBox measurement systems (OceanPack RACK, CUBE, RACE, AQUA, BUOY) plus sensors, samplers, subsea frames, landers and the NetDI controller for measuring pCO2, salinity, temperature, dissolved oxygen, pH, turbidity, nutrients and microplastics.
Is Subctech a public or private company?
Subctech is a private company. It is classified as corporate owned and is currently operating.
When was Subctech founded?
Subctech was founded in 2009.
Where is Subctech based?
Subctech is headquartered in Kiel, Germany, in the Europe region.
How does Subctech make money?
Four revenue lines are on record. Ocean Power Products are the primary driver. The others are ocean Monitoring Products, customized Solutions and consulting Services.
Who are Subctech's main competitors?
Direct peers on record are Saft (TotalEnergies), Sea-Bird Scientific, Aanderaa Data Instruments (Xylem), AML Oceanographic, nke Instrumentation and Corvus Energy. Broad incumbents are Teledyne Marine, Kongsberg Maritime and Kongsberg Discovery. Develogic GmbH is listed as an others.
Does Subctech have an API?
No public API is recorded for Subctech.
What industry is Subctech in?
Subctech's product category is Subsea Batteries & Ocean Monitoring Equipment. Its primary akta.pro industry code is IMAJAJAB, Marine Power Generation & Energy Storage (Generators, Batteries, UPS), with a secondary code of IMAJAJAI, Marine Sensors, Instrumentation & IoT (Condition Monitoring). Its NAICS code is 336611 and its SIC code is 3533.