The Guantanamo Bay to Dania Beach Submarine Fiber Optic Cable System (GTMO-1) is approximately 1530km (950miles), connecting the Defense Information System Network (DISN) Facilities at Miami FL and U.S. Naval Station Guantanamo Bay, Cuba (GTMO), in order to supply high bandwidth to Department of Defense (DoD) activities at GTMO, and improve long-haul communications between the continental U.S. and GTMO.

According to the U.S. Federal Register, The GTMO-1 cable system involves two existing, shore-based U.S. naval facilities where the GTMO SFOC will be landed end-to-end. On the continental U.S. end, the cable will be landed at the U.S. Navy's South Florida Ocean Measurement Facility (SFOMF) at Dania Beach, Florida; from there, the GTMO-1 cable system spans the entirety of Florida's Territorial Waters (3 nautical miles (nm)), extending through the U.S. Territorial Sea (12 nm) and Contiguous Zone (24 nm), with the majority of the cable system passing through a combination of the U.S. Exclusive Economic Zone (EEZ), the Bahamian EEZ, and the Cuban EEZ to the nearshore landing at the American Naval Station Guantanamo Bay.

The GTMO-1 cable system is owned and operated by the U.S. Defense Information Systems Agency (DISA). The DISA is a Department of Defense (DoD) combat support agency under the direction, authority and control of the Assistant Secretary of Defense for Command, Control, Communications, and Intelligence.

The DISA leases commercial dark fiber to facilitate the terrestrial connection between SFOMF and the Network Access Point (NAP) of the Americas in Miami, Florida to provide DISN node-to-node connection.

In May 2014, the US DoD awarded Xtera Communications the contract to build the GTMO-1 cable system.  Xtera Communicationst announced in June 2014 that it won the $31,220,394 contract for the 950-mile submarine cable system without ever mentioning Guantánamo. Xtera subsequently was awarded a $3.7 million contract to build the ground stations for the Guantánamo Bay to Dania Beach Submarine Fiber Optic Cable System, with a cost of approximately $35 million. Later in August 2017, Xtera was awarded by the DoD a contract of approxiamately US$43million to build a new submarine cable connecting Guantanamo Bay, Cuba, and  Puerto Rico, i.e., the GTMO-PR cable system.

The GTMO-1 cable system was ready for service in February 2016. 

Currently, GTMO-1 cable system is the first submarine cable directly connecting the United States and Cuba, but it is not served for commerical use.