Completed in December 1999, SEA-ME-WE 3 is one of the world’s longest and largest capacity submarine cable networks.  Costing US$1.5 billion, the cable spans 38,000 km and has 39 landing points straddling the Pacific Rim, South East Asia, the Middle East, North Africa and Western Europe.  The cable utilises 10 Gbps Wavelength Division Multiplexing (WDM) technology with Synchronous Digital Hierarchy (SDH) transmission which offers unparalleled enhanced network resilience and connectivity.  SEA-ME-WE 3 has been upgraded to a capacity of 70 Gbps.

SEA-ME-WE 4 is a high-capacity optical cable that spans some 20,000 km from Singapore to France via the Middle East.  Completed in December 2005, it is the fourth in the series of cables connecting Asia, Europe and North Africa.  Utilising Dense Wavelength Division technology, the system is able to carry up to a maximum of 64 wavelengths per fibre pair or a design capacity of 1.28 terabits per second. This is the equivalent of handling more than one million Internet users simultaneously having real-time access to a 1 Mb file.  The SEA-ME-WE 4 cable system, costing some US$500 million, is among the most economical cable systems in the region offering unparallel enhanced network resilience and connectivity.

SingTel has major stakes in the two Asia Pacific Cable Network cables.  The 12,000 km APCN network links Korea, Japan, Hong Kong, Taiwan, the Philippines, Thailand, Malaysia, Singapore and Indonesia.  Commissioned in January 1997, it provides a direct optical link between Australia and the rest of Asia.  APCN which costs US$640 million to build,  has a design capacity of 10 Gbps .  

APCN2, a 19,000 km cable, with a design capacity of 2.56 Tbps and a current equipped capacity of 160 Gbps, was completed end 2001.  The cable, costing US$1.1 billion, links China, Hong Kong, Japan, Korea, Malaysia, the Philippines, Singapore and Taiwan.

The China-US cable, built to the cost of US$1.4 billion, supplements SingTel’s cable capacity in the Trans-Pacific cable networks and offer enhanced cable diversity and reliability for international telecommunications services.  With a capacity of 80 Gbps, the 29,000 km long cable has immense capacity to support the telecommunications needs between Asian Countries and the US.  

The Japan-US cable network is a 4-fiber pair system with a design capacity of 640 Gbps.  The 21,000 km cable network costs US$1.32 billion.  Completed in September 2001, it is currently equipped up to 400 Gbps and offers enhanced cable diversity and reliability for international telecommunications services across the Pacific Ocean. 

In March 2001, SingTel and Bharti Group formed a 50:50 private submarine cable development company, Network i2i, to build the world's largest cable network in terms of bandwidth capacity (8.4 Tbps).  The US$220 million i2i cable network (i2icn) is a 3,100 km long cable linking Singapore and Chennai.  The entire i2i cable network utilises the latest Dense Wavelength Division Multiplexing (DWDM) technology to provide transmission facilities, which can be upgraded, to ensure durability.  i2icn will link to SingTel's extensive cable networks to the rest of the world.  This includes the C2C cable network, SEA-ME-WE 3 and APCN2.  The i2icn was completed in April 2002.

The Southern Cross cable lit up in November 2000 removing the bandwidth bottleneck between Australasia and the United States.  Originally designed to deliver 120 Gbps of fully protected capacity, Southern Cross was expanded in the first quarter of 2003 to 240 Gbps, with the potential of increasing total protected network capacity to 480 Gbps.  Southern Cross now has the potential to provide for Australasia's bandwidth requirements for the next five years, delivering 480 times the capacity of the PacRim system - enough to transfer a 3 km-high stack of typed documents or eight full-length motion pictures every second. 

The TIS (Thailand-Indonesia-Singapore) cable began carrying commercial traffic in December 2003.  The 1,100 km long cable network lands in Songkhla (Thailand), Batam (Indonesia) and Changi (Singapore) and is linked to SingTel's extensive submarine cable networks in Asia Pacific.  The US$36 million consortium cable has an initial and design capacity of 30 Gbps and 320 Gbps respectively.