Dive beneath the colorful streets of Old San Juan to explore a hidden network of mysterious tunnels that have withstood the test of time. Constructed during the Spanish colonial era, these secret passageways were strategically designed for military use and emergency escapes, connecting major forts like El Morro and San Cristóbal. In this video, we'll take you on a journey through the dark and intriguing history of these tunnels, revealing their purposes, the legends that have grown around them, and what remains of them today.