The tunnels were constructed to hold thousands of people during air raids, exceeding the city's population at the time of construction.
The network utilizes a 'zero' level architecture, meaning it was designed to be accessible from multiple points at street level.
During the Cold War, the tunnels were further reinforced and retrofitted to serve as nuclear fallout shelters.
The interior of the tunnels is primarily bare stone, showcasing the manual excavation techniques used in the Austro-Hungarian era.
The tunnels are connected to the central Venetian fortress (Kastel) which houses the Historical and Maritime Museum of Istria.
Zerostrasse is an extensive underground tunnel system built beneath Pula during the early 20th century, specifically serving as a shelter during World War I. The network consists of interconnected passages carved directly into the bedrock, originally designed to protect the civilian population from aerial bombardments. Its tunnels connect several key defensive points, including the central hill dominated by the Venetian fortress, Kastel. The site spans several hundred meters and features multiple entrances located throughout the Pula city center. Today, it serves as a historical exhibition space and a venue for occasional cultural events. The tunnels maintain a naturally cool temperature, providing a stark contrast to the Mediterranean heat above ground. The structure remains one of the most significant examples of military engineering for civil protection in the Adriatic region.
The long, arched stone corridors at the main junction point near the center of the network, which highlight the impressive scale of the tunnels.
Bring a light jacket as the temperature remains significantly lower than the outside air regardless of the season.
Wear comfortable, non-slip walking shoes as the floors can be uneven or damp.
Combine your visit with the Historical and Maritime Museum of Istria for a comprehensive look at the region's military history.
Do not attempt to traverse the entire network without a map or designated signage, as certain sections may be blocked for safety or maintenance.
Operations vary by season; the tunnels often have reduced access or closures during the winter months.
Maintain a quiet volume to respect the acoustics of the tunnels; smoking and littering are strictly prohibited.
