Submarine Cable Manufacturer - ZTT

Submarine cables for carrying international traffic and carry more than 95% of international data.

  • Easy to use and diver safe
  • Made to provide greater bandwidth and fast response times
  • Higher security and great reliability
  • Very cost-effective than satellites

ZTT Submarine Cable

Submarine cables are wires wrapped with insulating and waterproof materials. It is laid underwater on the seabed and rivers for power or communication transmission.

In order to connect island grids, land islands, offshore drilling platforms, offshore wind farms, and other offshore developments, submarine cables are used for communication and power transmission.

For many years, ZTT Company has researched the production of submarine cables. Whether from underwater environment research, marine physical analysis, or a case study of the biggest projects worldwide.

We also use complex technologies for cable design, production, and installation. Our submarine cables are warranted for exceptional performance and long-term durability.

Submarine Cable Types

Submarine Power Cables
MV & HV Submarine Power Cables
Submarine Optical Fibre Cables
Submarine Optical Fibre Cables
Optical Fibre Composite Submarine Cables
Optical Fibre Composite Submarine Cables

ZTT Company Values


ZTT has been manufacturing submarine cables and other marine cables for 20+ years.


We have built a reputation for manufacturing submarine cables and on-time delivery.


We aim for nothing less than perfection, therefore, we assure fast yet secured delivery.


ZTT’s dedication to innovation yields solutions that include the newest technological developments.

Two Major Types of Submarine Cable

Submarine Communications Cable – It is a cable installed on the sea bed between land-based stations to transport telecommunication signals over regions of the ocean and sea.

Submarine Power Cable – A transmission cable used to transmit electricity underneath the surface of the water. Often referred to as “submarines” because they typically transmit electricity below salt water like the ocean, seas, straits, etc though, it is also possible to use them below fresh water like large lakes and rivers.

Two Major Types of Submarine Cable
Submarine Cable Thicknesses

Submarine Cable Thicknesses

The submarine cable is commonly as wide as a garden hose for the most of its journey across the ocean. The filaments that transmit light signals have a diameter that is comparable to a human hair.

A few layers of insulation and security surround these wires. Cables positioned closer to the beach are protected by additional layers of armour.

Submarine Cables Installation

The cables go all the way down to the bottom of the ocean floor.

However, the reason cables are hidden under the seabed closer to the shore is for protection, which also explains why you won’t see cables at the beach. On the other side, in the deep sea, these cables are laid straight on the ocean floor.

Of course, great care is made to make sure cables take the safest route in order to avoid threats like fault zones, fishing zones, anchoring regions, and others.

Submarine Cables Installation
Industry Applications

Industry Applications

Most of marine sectors such as the following require submarine cables.

  • Telecom carriers
  • Multinational corporations
  • Mobile operators
  • Research institutions
  • Content providers

Manufacturing Process of Submarine Cables

Quality and R&D Capabilities
Cable Production Process

The entire production of the submarine power cable is almost identical to that of the regular power cable.

However, there are special requirements for the submarine cable’s tensile strength and corrosion resistance. Additionally, its length must be extended as much as possible. The following is a brief description of the production process of extruded insulated submarine cables and impregnated paper cables.

  • Impregnated paper cable is first wrapped in an insulating paper core, then vacuum dried, dipped in oil, finished with a conductor core, and last wrapped in a lead sheath that is continuously extruded.
  • Extremely lengthy cable cores must be extruded, which is a step that must be done day and night. The oil-filled cable’s conductor core travels from the storage cylinder to the lead press through a syphon transport tube. Degassing oil, which travels in the opposite direction to the conductor core to prevent contact between the core and the air, is also poured into the tube.
  • The core is wrapped in lead and then wound around a spinning platform. The submarine cable is then sheathed in polythene. Afterward, it was covered with an oiled hemp impregnation and two layers of galvanized steel wire armor.

ZTT Submarine Cables Advantages
ZTT Submarine Cables Advantages
  • First, laying requires less investment and higher efficiency because there is no requirement to dig a trench.
  • Second, in addition to the landing area, the deepest submarine cable is typically in a certain test of the seabed. It is not vulnerable to interference by human activities or natural environment.
  • As a result, the submarine line is secure and reliable, and it performs well in terms of both confidentiality and anti-interference.
Characteristics of ZTT Submarine Cables
Characteristics of ZTT Submarine Cables
  • They provide extremely high capacity, highly reliable, and secure communication linkages between nations worldwide.
  • Depending on the installation’s conditions and requirements, the cable’s outer protection is accomplished by a PVC or PE sheath and multiple layers of polypropylene yarns or jute.
  • They have a significantly larger capacity than satellites and continue to be more dependable, transmitting around 95% of all international data between islands and continents.
ZTT Submarine Cables
Why Top 500 Company Choose ZTT as a Reliable Submarine Cable Supplier

ZTT has full experience in manufacturing submarine cables. We supply a wide range of submarine cables to Top 500 companies from different countries globally.

Specifications of Submarine Cable

Construction Designed in accordance with IEC60502-2 and BS 6622.
Conductor IEC 60228-compliant stranded compacted circular plain copper conductors must be used to construct the cable.
Water Barriers Used to stop water from getting between and among the cable’s multiple layers.
Metallic Sheath It must be waterproof, and the guaranteed technical schedules must include specifics about the material used.
Conductor Screen To completely cover the conductor’s surface, a conductor screen made of an extruded layer of cross-linkable semi-conducting material is used.
Insulation Cross-linked polyethylene (XLPE) that complies with IEC 60502-2 standards should be used as insulation.
Test and Inspection The cables are inspected and tested in accordance with the IEC 60502-2 and IEC 60228 standards.
Which cable is used in submarine?

Fiber optic cables known as undersea or submarine cables are used to connect continents by being placed on the ocean floor. These cables, which are frequently thousands of miles long, have the capacity to send massive volumes of data quickly from one location to another.

How many submarine cables exist?

With 487 connections and 1,304 different landing sites in its database, an interactive map of the world’s undersea communications cables is now available.

What is submarine cable made of?

Fiber-optic technology is used in modern submarine cable production. Lasers on one end of the cable fire incredibly quickly along fine glass fibres to receptors on the other. For safety, these glass fibres are encased in several layers of plastic, sometimes steel wire.

How deep do submarine cables go?

Without halting, the ship travels the lay path while installing the cable on the seafloor, which is up to 11,000 metres deep at its deepest point and has an average depth of 3,600 metres. During laying, the cable is extended up to 8,000 metres behind the lay ship.

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