APCN 2 or Asia-Pacific Cable Network 2 is a submarine telecommunications cable linking several countries in the Asia-Pacific region.
It has landing points in:
- Chongming, Shanghai, China
- Shantou, Guangdong Province, China
- Lantau Island, Islands District, Hong Kong
- Chikura, Chiba Prefecture, Japan
- Kitaibaraki, Ibaraki Prefecture, Japan
- Tamsui, New Taipei City, Taiwan
- Kuantan, Pahang State, Malaysia
- Batangas Bay, Batangas City, Batangas Province, Philippines
- Katong, Singapore
- Busan, South Korea
Total bandwidth capacity of Asia Pacific Cable Network 2 is 2.56 Tbit/s, made up of four pairs of optical fibres, each pair providing 640 Gbit/s by Dense Wavelength Division Multiplexing of 10 Gbit/s wavelengths. The 19,000 km-long APCN 2 cable system is built in a self-healing ring configuration, which allows fast rerouting of data transfers along APCN 2 in the event of disruptions. The cable system, as of January 2007, is progressively becoming operational. APCN 2 is designed to provide interconnection with other major trans-oceanic cable networks linking the USA, Europe, Australia, and other parts of Asia.
On 27 Dec 2006, the 2006 Hengchun earthquake damaged the APCN 2 cable links between Shantou, China and Tanshui, Taiwan, and between Lantau Island in Hong Kong and Chongming, China. This disrupted Internet access to overseas websites from Asia for more than a month.
On 12 Aug 2009, the APCN2 cable suffered further damage, impacting Hong Kong, China, Taiwan, Philippines, Singapore and Tokyo links.
In June 2010, the cable suffered some major faults, disrupting the Internet Access in the Philippines.
On 11 March 2011, the APCN2 cable suffered damage as part of the 2011 Tōhoku earthquake.
On 7 January 2015, the APCN2 cable failure between Singapore and Asia Pacific. This outage resulted in bandwidth restrictions and significant latency issues in Singapore to Asia Pacific from 7 January 2015 outage resolved on 31 January 2015 (source: Singtel / Singnet TAC) date=2015-01-29
On April 22, 2017, damage to the APCN2 cable affected Taiwan internet users. 
- Internet Access to overseas website disrupted
- Communications cut off after earthquake strikes Taiwan Archived January 3, 2007, at the Wayback Machine.
- Internet access in Singapore severely affected by Taiwan quake
- Lemon, Sumner (12 August 2009). "Asian undersea cable disruption slows Internet access". Computerworld. Retrieved 3 November 2015.
- Umbao, Ed (2014-04-01). "PLDT Explains Internet Speed Problems in the Philippines From March 28 Onwards". Philnews.ph. Retrieved 2014-05-09.
- "Damaged undersea cables affect Internet in PH, Asia-Pacific". Rappler. 2 April 2014. Retrieved 3 November 2015.
- "Damaged APCN2 undersea cables affecting internet in Taiwan". Focus Taiwan. 2017-04-23. Retrieved 2017-04-23.
- PDF map of APCN 2
- Conclusion of APCN 2 Construction and Maintenance Agreement
- Asia-Pacific Cable Network 2 has serious cable fault, includes map, August 12, 2009