Delivering, maintaining, and operating the best value undersea networks on the planet

Undersea Fiber Optic Cable

From the very beginning, SubCom has been a leader in defining the undersea cable industry. We continue that proud tradition today as we drive ever-improving quality and efficiency of undersea data transmission. SubCom designs, manufactures, deploys, maintains, and operates modern networks with an industry-leading track record for delivery and performance, providing the most comprehensive technical and marine expertise, with the highest quality, and most reliable solutions.

+ Times Around the Earth
+ Systems Deployed
% Delivered On-Time
+ Optical Repeaters
~Since 1955~

Our Capabilities


SubCom combines our research and development, broad product portfolio, manufacturing facilities, fleet of ships, and management team to offer numerous unique capabilities for implementing flexible and scalable repeaterless to ultra-long-haul undersea networks. We engineer custom-tailored systems anywhere on the planet.

With a tradition of exceptional reliability, performance and service, and technical expertise, we support our customers’ needs from system design, permitting and marine engineering solutions, manufacturing, installation, to system testing for traditional data transport requirements, as well as scientific and oil and gas applications.

Our industry-leading track record allows us to provide robust, highly reliable installed systems on time that deliver the most value to our customers while consistently exceeding expectations for performance and partnership.


Marine Maintenance:
For more than half a century, SubCom’s fleet has sailed the oceans of the world, maintaining the undersea cables that form the backbone of the international communications network. Maintenance is performed by the industry’s most capable fleet of cable ships from their strategic locations around the globe.

System Operations:
SubCom’s Global Technical Support Center (GTSC) provides dedicated support to troubleshoot system issues and SubCom’s Network Operations Center (NOC) services provide support to keep systems operating smoothly and efficiently 24/7/365.

Customer Testimonials

"Since the implementation of the Svalbard system in 2004, Space Norway has enjoyed a strong and enduring relationship with SubCom. For over 14 years, SubCom has delivered unprecedented support for this unique cable system, providing uninterrupted service during three capacity upgrades and a CLS equipment consolidation and relocation operation, helping to meet Space Norway's current and future growth requirements. We strongly believe in SubCom's project management and engineering teams to deliver upgrades with professionalism and dedication, and when coupled with the long-term support provided by their Global Technical Support Center (GTSC), we benefit from a level of service and commitment that is second to none in the industry."

Jostein Rønneberg CEO of Space Norway

"Following a very successful transition to SubCom in 2017 as the new supplier for Telstra’s subsea maintenance requirements in the South Pacific Marine Maintenance Zone, the team has continued to provide exceptional levels of service, from the finance team right through to the operational team. It is great to have such a high level of engagement and support."

David Copeland Senior Procurement of Telstra

"The collaboration between MainOne and SubCom for the MainOne system was a great success that brought connectivity and economic opportunity along Africa’s west coast. SubCom’s superior technology created a robust and highly-reliable system, and the excellent teamwork and ongoing support we’ve received from everyone at SubCom is again front and center, on our latest MainOne expansion. We couldn’t imagine doing this with any company other than SubCom."

Funke Opeke CEO of MainOne Cable Company

"SubCom provided us with an innovative and flexible solution which included a lifecycle partnership through their remote NOC services and commitment to retain a maintenance vessel in our region."

Simon Fletcher CEO of Interchange

"I’m impressed with SubCom’s quick adaptation to mould flexible solutions that meet market demands and customer needs. Tailoring towards the needs of the future…that’s a key thing for me."

Nigel Bayliff CEO of Aqua Comms

"The SubCom culture fits perfectly with our developer mindset. SubCom found solutions on terms and design to accommodate our requirements and evolutions, during the system design and then during the implementation."

Remi Galasso CEO of Hawaiki

We are very pleased to be working with SubCom to extend our Norwegian sustainable data center and network infrastructure. The quality and experience they have delivered to Norway´s two cables from Andenes to Svalbard above the Arctic Circle makes a very convincing reference to us.

Peder Naerboe Chairman and Owner of Bulk Infrastructure

Recent Projects

South Pacific Subsea Cable (SPSC)


A six fiber pair system able to carry 22Tbps per fiber pair for a total system capacity of 132Tbps.


Cable System

A new high-speed undersea cable system connecting Iceland and Ireland.

Grace Hopper

Cable System

Will be one of the first new cables to connect the U.S. and U.K. since 2003.

Oman Australia Cable


An international subsea cable system that will directly connect Muscat, Oman to Perth, Australia.


Cable System

Unique international collaboration to transform regional speed, resilience, and affordability.


Mogadishu Branch

Djibouti Telecom, Somtel, and SubCom announce Mogadishu branch of DARE1 cable system. Somtel joins DARE1 submarine cable system, the high-capacity, short-haul cable system that will connect Djibouti, Somalia, and Kenya.


Senegal & Ivory Coast

SubCom chosen to extend MainOne Cable System to francophone region. New landings designated for 7,000km submarine communications cable stretching from Portugal to West Africa.


Cable System

Google selects SubCom to design and deploy Dunant cable system. Dunant submarine cable system will link the East Coast of the United States to Europe.


Cable System

Consortium including Facebook, Google, announces contract in force for SubCom as supplier for HAVFRUE cable system. First new undersea cable to traverse Northern Atlantic, connecting mainland Northern Europe to U.S.A., in nearly twenty years.

Recent News

14 September 2021
Grace Hopper subsea cable has landed in the UK

SubCom mentioned in Google blog

Full Story

2 September 2021
SubCom completes installation of SPSC/Mistral with new South Pacific submarine cable ready for service

Providing greater transmission capacity and redundancy, new system from Telxius and Claro (América Móvil) runs along the Latin American Pacific coast to link Guatemala, Ecuador, Peru, and Chile and provide a direct connection with the US

Full Story

9 June 2021
SubCom announces contract-in-force for Firmina; a new undersea cable system connecting North and South America

Google’s Firmina will run from the East Coast of the U.S. to Las Toninas, Argentina; SubCom’s 18kV technology will enable the longest cable in the world capable of running entirely from a single power source

Full Story Google Cloud Blog

28 May 2021
Confluence-1: The new North-South route

Subsea specialists SubCom to carry out the desktop survey

Full Story

17 May 2021
India at the Center of Two New Subsea Cable Systems to Support Exponential Data Growth

Jio’s IAX and IEX Projects to Address Region’s Data Revolution

Full Story

5 April 2021
Farice and SubCom announce contract-in-force for IRIS, newest undersea cable to link Iceland to Europe

IRIS will offer increased security, redundancy, wholesale capacity linking Iceland with Ireland

Full Story

Dunant Submarine Cable System, First to Use SDM Technology, Ready for Service

Google's Subsea Cable Connects the U.S. and France, Transmitting at Record-Breaking 250 Tbps Using SubCom's 12 Fiber Pair SDM Design

Full Story

20 JANUARY 2021
Oman Australia Cable (OAC) 100% Cable Manufactured with Marine Installation to Commence in March 2021

SUB.CO today announced its 9,800km Oman Australia Cable (OAC) has now been fully manufactured with load #1 of 2 assembled, tested and now being loaded onto a freighter to transfer to the main-lay ship for installation from March 2021.

Full Story

Read More News Here

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