The AC-1 (Atlantic Crossing 1) is a 14,000 km trans-Atlantic submarine cable system linking the USA and three European countries, the U.K., the Netherlands and Germany.

Global Crossing announced to build the AC-1 submarine cable project in 1997. And the AC-1 cable system was ready for service in 1999.

The AC-1 cable system comprises four fiber self-healing Synchronous Digital Hierarchy (SDH) ring network connecting the United States with the United Kingdom and Germany, with an initial design system capacity of 40Gbps (8*2.5G DWDM, 2 fiber pairs).

The AC-1 cable lands at the following cable landing stations:

• Brookhaven Cable Landing Station, the United States,
• Whitesands Bay Cable Landing Station, the United Kingdom
• Deutsche Telekom's Sylt Cable Landing Station, Germany
• KPN's Beverwijk Cable Landing Station, Netherlands

The AC-1 cable system was privately owned by Global Crossing. Following the acquisition of Global Crossing by Level3 in 2011 and the acquisition of Level3 by CenturyLink in 2017, the AC-1 is now wholly owned by CenturyLink, as well as AC-2/Yellow, Mid-Atlantic Crossing (MAC), Pan-America Crossing (PAC), South America Crossing (PAC), etc.