The Guantanamo Bay to Punta Salinas, Toa Baja, Puerto Rico Submarine Fiber Optic Cable System (GTMO-PR) is approximately 1,400 kilometers (756 nautical miles), connecting the Defense Information System Network (DISN) Facilities at U.S. Naval Station Guantanamo Bay, Cuba (GTMO) and  Ft. Buchanan, Puerto Rico, in order to supply high bandwidth to Department of Defense (DoD) activities at GTMO, and improve long-haul communications between the continental U.S., Puerto Rico and GTMO.

According to the U.S. Federal Register, The GTMO-PR cable system connects the Defense Information System Network (DISN) node located offshore at Guantanamo Bay (GTMO), Cuba to the DISN node located in Fort Buchanan, Puerto Rico. The GTMO-PR cable land into a pre-laid shore end stub cable (installed in 2016 as part of GMTO-1 cable project) ending 19 kilometers (10.26 nautical miles) offshore of the Guantanamo Bay Naval Station, Cuba to the DISN node located in Fort Buchanan, Bayamon, Puerto Rico. The landing location for Puerto Rico is the Puerto Rico Air National Guard (PRANG) Radar installation located in Punta Salinas, Toa Baja through a horizontally directional drilled (HDD) pipe. For the subsequent connection to the Army Reserves Base, Fort Buchanan in Bayamon.

The GTMO-PR 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 local circuit services to facilitate the terrestrial connection to the Army Reserves Base, Fort Buchanan in Bayamon, Puerto Rico. The DISA also leases commercial dark fiber to facilitate the terrestrial connection between the GTMO-1 cable landing station and the Network Access Point (NAP) of the Americas in Miami, Florida. With GTMO-1 and GTMO-PR cable systems, DISN forms node-to-node connection between the continental U.S., Puerto Rico and GTMO.

In August 2017, Xtera was awarded by the DoD a contract of approxiamately US$43million to build the GTMO-PR cable system. Earlier in May 2014, the US DoD awarded Xtera the contract to build the GTMO-1 cable system.

The GTMO-PR cable system was ready for service in September 2019.

The GTMO-PR cable system is not served for commerical use.