 In 1903 an underwater cable between Sitka, Alaska and Seattle, Washington was also laid, allowing rapid communication between Alaska and the lower continental U.S.

By 1918, the 1st Signal Service Company was activated at Valdez, Alaska and 2nd Signal Service Company at Fort Gibbon to operate WAMCATS in Alaska.The 2nd Signal Service Company was not formally inactivated until 1927.The vessel CS "Dellwood" undertook the laying of a new submarine cable in 1924 between Seattle and Alaska with a post at Ketchikan.