Undersea Communication Cables: Strategic Backbone of the Global Digital Economy

Recent Developments:

• Rising incidents of suspected cable sabotage in regions such as the Baltic Sea, Red Sea and Taiwan Strait have highlighted the strategic importance of undersea communication infrastructure for national security, digital connectivity and global trade.
• In 2024, the International Telecommunication Union (ITU) and the International Cable Protection Committee (ICPC) established the International Advisory Body for Submarine Cable Resilience to strengthen the security and resilience of global submarine cable networks.
• With more than 99% of intercontinental digital traffic moving through submarine cables, governments are increasingly treating them as critical infrastructure requiring strategic protection. International Telecommunication Union International Cable Protection Committee

Understanding Undersea Communication Cables:

Meaning and Evolution:

• Undersea communication cables are insulated communication links laid on the seabed to transmit information across oceans and seas.
• The earliest systems consisted of telegraph cables, while modern networks use fibre-optic technology capable of transmitting massive volumes of digital data at high speed.
• These cables transformed long-distance communication by reducing message transmission times from weeks or months to a matter of minutes and later to near-instantaneous transmission.
• The world's first successful undersea telegraph cable was laid across the English Channel in 1851, marking the beginning of global submarine communications.
• Modern submarine fibre-optic cables form the physical foundation of the global internet, international banking systems, cloud computing services and digital commerce.

The All-Red Line and Imperial Communications:

Emergence of the All-Red Line:

• During the late nineteenth century, Britain constructed an extensive submarine telegraph network connecting different parts of its empire.
• The network became known as the All-Red Line because British territories were traditionally depicted in red on imperial maps.
• The communication system enabled rapid transmission of military, administrative and commercial information across the empire.
• The network was deliberately routed through British-controlled territories to reduce dependence on rival powers and enhance strategic security.
• Important routes passed through the Strait of Gibraltar, Mediterranean Sea, Malta, Suez Canal, Red Sea, Indian Ocean, Bombay and extended towards Hong Kong.
• The All-Red Line demonstrated how communication infrastructure could serve as an instrument of geopolitical influence and strategic control.

Strategic Importance of Undersea Cables in the Modern Era:

Role in the Global Economy and Security:

• More than 99% of global intercontinental internet traffic is carried through submarine cable systems rather than satellites.
• International financial transactions worth trillions of dollars depend upon uninterrupted cable connectivity.
• Global cloud computing services, e-commerce platforms, digital payments and government communications rely heavily on submarine cable networks.
• Military command systems, intelligence sharing and strategic communications increasingly depend upon secure undersea data infrastructure.
• Submarine cables have become as strategically important in the digital age as sea lanes were during earlier eras of global trade.

Major Vulnerabilities Associated with Undersea Cables:

Physical, Technological and Security Risks:

• Multiple submarine cables are often concentrated along similar seabed routes, creating potential single points of failure.
• Damage to a few strategically located cables can disrupt communications across entire regions.
• Repair operations require specialised vessels, advanced technical expertise and international coordination, making restoration difficult during crises.
• Natural hazards such as earthquakes, volcanic activity, underwater landslides and tsunamis can damage cable networks.
• Fishing activities, ship anchors and accidental maritime incidents remain major causes of cable disruptions.
• Hybrid warfare tactics and state-sponsored sabotage have emerged as growing threats to critical underwater infrastructure.
• Existing international legal provisions provide limited clarity regarding accountability for intentional cable disruptions during grey-zone conflicts.

India's Undersea Cable Ecosystem:

Current Status and Connectivity:

• India is an important participant in the global submarine cable network with 17 international submarine cables and 14 cable landing stations.
• Major landing stations are located in coastal cities such as Mumbai, Chennai, Cochin, Tuticorin and Trivandrum.
• By the end of 2022, India's total lit capacity and activated capacity stood at approximately 138.606 Tbps and 111.111 Tbps respectively.
• India is connected to global digital networks through systems such as South East Asia–Middle East–Western Europe 4 (SMW4), India–Middle East–Western Europe (IMEWE) and several other international cable corridors.
• These networks support India's digital economy, information technology services sector and international data exchanges.

Challenges Faced by India:

Technological, Regulatory and Operational Deficiencies:

• India lacks a comprehensive legal framework specifically designed to protect submarine cable infrastructure within territorial waters and the Exclusive Economic Zone (EEZ).
• Unlike countries such as Australia, India has not established dedicated Cable Protection Zones for safeguarding critical cable routes.
• India currently lacks indigenous submarine cable repair vessels and remains dependent on foreign ships for maintenance and emergency restoration.
• Dependence on external repair capabilities can significantly increase recovery time following cable damage.
• Real-time underwater surveillance and monitoring infrastructure remains limited, reducing the ability to detect threats and disruptions promptly.
• Increasing digitalisation of governance, banking and commerce makes these vulnerabilities a significant national security concern.

International Efforts to Enhance Submarine Cable Resilience:

International Advisory Body for Submarine Cable Resilience:

• The body was established in 2024 by the International Telecommunication Union in partnership with the International Cable Protection Committee.
• Its objective is to strengthen global submarine cable resilience through policy coordination, risk assessment and best-practice recommendations.
• The initiative focuses on addressing growing data traffic, ageing infrastructure, environmental threats and geopolitical risks.
• It promotes cooperation among governments, industry stakeholders and international organisations to improve cable security.

International Cable Protection Committee (ICPC):

Role and Functions:

• The International Cable Protection Committee was established in 1958 as a global platform for governments and commercial stakeholders involved in submarine cable operations.
• It facilitates the exchange of technical, legal, operational and environmental information relating to cable systems.
• The organisation promotes best practices for cable installation, maintenance and protection.
• It works to reduce risks arising from maritime activities and supports the development of international standards for cable security.

Legal Framework Governing Undersea Cables:

Relevant International Provisions:

• The United Nations Convention on the Law of the Sea recognizes the freedom to lay submarine cables on the high seas and within certain maritime zones.
• Coastal states possess rights and responsibilities regarding cable protection within territorial waters and exclusive economic zones.
• International law requires states to avoid unnecessary interference with submarine cable operations.
• However, significant legal ambiguities remain regarding intentional disruption of cables during hybrid warfare and geopolitical confrontations.

Significance for India:

Strategic and Economic Importance:

• India's ambition to become a global digital hub depends upon secure and resilient submarine cable infrastructure.
• Programmes such as Digital India, cloud computing expansion, fintech growth and artificial intelligence development require high-capacity international connectivity.
• Protection of submarine cables is essential for national security, economic stability and technological competitiveness.
• Enhanced resilience can strengthen India's position as a major data centre and digital services destination.
• Secure cable infrastructure is increasingly becoming a component of maritime security strategy in the Indian Ocean Region.

Way Forward:

Measures Required for Strengthening Resilience:

• India should establish dedicated cable protection zones around critical submarine cable routes and landing stations.
• Indigenous cable repair and maintenance capabilities should be developed to reduce dependence on foreign service providers.
• Deployment of underwater surveillance systems, autonomous monitoring platforms and maritime domain awareness technologies should be expanded.
• Public-private partnerships should be encouraged for strengthening cable infrastructure security.
• Greater cooperation with regional partners and international organisations should be pursued to address transnational threats.
• Legal and regulatory frameworks should be updated to provide clear mechanisms for cable protection and incident response.
• Diversification of cable routes should be encouraged to reduce concentration risks and improve network redundancy.

Value Addition for UPSC:

Important Facts, Concepts and Institutions:

• More than 99% of intercontinental internet traffic is transmitted through submarine cables.
• The first successful undersea telegraph cable was laid across the English Channel in 1851.
• The All-Red Line represented Britain's global imperial telegraph network connecting major colonies through secure communication routes.
• Exclusive Economic Zone (EEZ): Extends up to 200 nautical miles from the coastal baseline and grants sovereign rights over marine resources.
• Cable Protection Zone: A designated maritime area where activities capable of damaging submarine cables are regulated or restricted.
• International Telecommunication Union (ITU): Specialized agency of the United Nations responsible for information and communication technologies.

International Cable Protection Committee (ICPC): Principal international organization promoting submarine cable security and resilience.