New subsea cable will serve growth in Mexico's Yucatan Peninsula A 1,200-kilometre advanced subsea fibre optic cable system is being planned by FB Submarine Partners, Xtera, IT International Telecom and GigNet. It will connect Florida in the US and Cancun in Mexico. Telmex, Mexico's leading telecommunications provider, has inaugurated the TM5X submarine cable, a significant infrastructure project designed to enhance internet connectivity between Baja California Sur and Sinaloa. The 383-kilometer fiber-optic cable, which traverses the Gulf of California. Allen, Texas – Xtera, Inc. FB Submarine Partners LLC, a. On the evening of October 7, Jiangsu Hengtong Optic-Electric Co. (hereinafter referred to as "the company") issued an announcement.