The Underground Reservoir exhibit offers visitors a rare opportunity to witness the Carriedo Waterworks in its preserved state. Through photographs, artifacts, and historical reconstructions, the exhibit demonstrates how this reservoir supplied clean water to Manila during the Spanish colonial period. It highlights not only the technological achievement but also the social reforms tied to public health and urban planning.

Visitors can explore walkways that mirror the original design, interact with multimedia displays, and engage with guided tours that narrate the story of water in Manila. This permanent exhibition is a testament to the city’s heritage and the lasting value of its underground treasures.