Atlantic Crossing 1 (AC-1) is an optical submarine telecommunications cable system linking the United States and three European countries.

It transports speech and data traffic between the U.S., the U.K., the Netherlands and Germany.

[1] It is one of several transatlantic communications cables.

It was operated by American company Level 3 Communications and Irish company Tyco International, until their respective mergers in 2017 and 2016 with other companies.

It has landing points in: