Pakistan Telecommunication Company Limited (PTCL), the state-owned telecom operator, announced Monday that repair work on one of its submarine cables would commence April 14 and potentially extend through April 20. The maintenance operation is expected to cause service degradation during evening hours, the company said in a statement, as Pakistan’s internet infrastructure faces pressure from rising demand on undersea connectivity routes.
PTCL operates three of the six submarine optical fibre cable systems that deliver international internet connectivity to Pakistan. The other systems are managed by Trans World Associates (Pvt) Ltd, which operates two cable networks, and Cyber Internet Services, which operates the PEACE cable infrastructure. Combined, these six submarine systems have a total capacity of 13 terabits per second (Tbps), according to publicly available data on Pakistan’s telecom infrastructure.
The announced repair work underscores the critical role submarine cables play in Pakistan’s digital economy and connectivity landscape. These underwater fibre optic networks are the backbone of international bandwidth for the country, carrying the vast majority of cross-border data traffic. Any disruption to even one cable system creates cascading pressure on alternative routes, particularly during peak usage hours when internet traffic surges across urban centres and business districts.
Current national internet usage ranges between 7 and 8 Tbps, meaning Pakistan’s six-cable infrastructure operates at approximately 54-62 percent capacity utilization. While this suggests adequate headroom for redundancy, the concentration of traffic during evening peak hours—when residential users, streaming platforms, and online services experience simultaneous demand—creates bottlenecks that render excess capacity theoretically available but practically unavailable during congestion periods.
PTCL’s announcement indicates the repair is routine maintenance rather than emergency intervention, suggesting the cable degradation was detected through standard monitoring protocols. However, the timing during what is typically Pakistan’s heaviest internet usage window raises questions about maintenance scheduling. The company did not specify whether the repair window could be shifted to off-peak hours or whether the work is time-sensitive for technical reasons that preclude rescheduling.
For Pakistani internet users, businesses relying on cloud services, and the growing technology sector centred in Karachi, Lahore, and Islamabad, the announced service degradation during April 14-20 represents a tangible operational risk. E-commerce platforms, financial technology firms, and remote work operations may experience latency spikes and bandwidth throttling during evening hours. Streaming services, video conferencing, and real-time applications could face quality degradation. The extent of impact will depend on traffic rerouting efficiency through the remaining five submarine cable systems.
The repair work also highlights infrastructure vulnerabilities in Pakistan’s digital backbone. Undersea cable systems operate for 15-25 years before requiring major maintenance, but damage from ship anchors, fishing activities, or natural degradation necessitates periodic repairs. With Pakistan’s digital economy expanding—the telecom sector contributed 2.5 percent to GDP in recent fiscal years—redundancy and infrastructure resilience have become strategic concerns. The country’s dependence on submarine cables underscores the importance of diversifying connectivity routes and expanding domestic fibre infrastructure.
PTCL’s statement provided no contingency timeline or backup capacity estimates. Industry observers will monitor whether the announced April 20 deadline holds and whether evening service degradation remains localized to specific regions or affects countrywide connectivity. Future infrastructure planning will likely incorporate lessons from this maintenance window, particularly regarding scheduling protocols and capacity buffer maintenance during peak demand periods.
