The Sines to Lisbon submarine cable is a domestic submarine cable connecting Sines to Lison in Portugal.

The Sines to Lisbon submarine cable is developled privately by EllaLink. 

EllaLink owns and operates the EllaLink cable connects Europe to South America from Portugal to Brazil, offering the shortest latency route from Europe to South America. By creating the Sines to Lisbon domestic subsea cable system, EllaLink is reinforcing Portugal's interconnectivity ecosystem.

The Sines to Lisbon submarine cable features:

• Direct DC to DC dark fibre connectivity with CLS pass through, and alternative on-demand PoPs; 
• Ultra-high capacity with 48 unrepeated fibre pairs with an optimised optical design; 
• A buried subsea & land cable, providing a DC entry point diversity and HDD protection in Sines, with a robust & diverse route design; 
• Sustain Diversity, and; 
• Interconnectivity between the most relevant networks through the Equinix network

There are five main cable landing sites in Portugal: Sesimbra, Carcavelos, Seixal, Lisbon and Sines.