Zerostrasse: Discover Pula’s Hidden Underground Tunnels

Zerostrasse is a network of Austro-Hungarian tunnels beneath Kaštel hill in the centre of Pula, built during the First World War as air-raid shelters. About 400 metres are open to visitors, with the entrance at Carrarina 3 near the Twin Gates. A lift links the tunnels with Kaštel fortress and the Historical and Maritime Museum of Istria. It is open daily, 9:00 to 21:00 from 1 May to 30 September and 9:00 to 17:00 from 1 October to 30 April, which makes it a great rainy-day or winter outing from Arena Stoja Campsite.

Roman monuments may dominate Pula above ground, but another part of the city’s history lies hidden beneath its streets. Under Kaštel, the hill at the centre of the old town, cool, echoing corridors reveal Pula’s former role as one of the Austro-Hungarian Empire’s most important naval strongholds, and offer welcome relief from summer heat and autumn rain alike.

Zerostrasse at a glance

Why were the tunnels built?

Before and during the First World War, Pula was the principal naval port of the Austro-Hungarian Monarchy, so protecting the city, its people and its military infrastructure was a priority. Tunnels and shelters were dug under the central hills as protection from air raids. The system included communication passages, storage areas and munitions depots.

The tunnels beneath Kaštel have four entrances around the base of the hill. They meet in a central underground chamber, and the layout lets air circulate through the whole system.

A city beneath the city

The underground system kept developing after the First World War. New fallout shelters were built after the Second World War, and the tunnels served as shelters again during the Croatian War of Independence. Today Pula’s shelters together can hold more than 50,000 people, nearly the city’s entire population.

Walking through Zerostrasse gives you a completely different view of Pula. Rock and concrete walls, subdued lighting and the echo of footsteps create an atmosphere far removed from the lively streets above. It stays cool all year, so even in August a light jacket is a good idea.

From the tunnels to Kaštel

A lift connects the lower tunnels with the underground level of Kaštel, home to the Historical and Maritime Museum of Istria. From there you can continue to the fortress and enjoy panoramic views across Pula. One ticket covers both Zerostrasse and Kaštel.

In a single visit you move through several periods: Roman streets outside, Austro-Hungarian tunnels below and a hilltop fortress above.

Planning your visit

The main entrance is at Carrarina 3, close to Pula’s Twin Gates. Opening hours differ between summer and winter, so check ppmi.hr before you go. Wear comfortable shoes and expect dim lighting and cool air.

Suggested route: start at the Amphitheatre, walk through the old town to the Twin Gates, descend into Zerostrasse and take the lift up to Kaštel.

Rainy day or winter in Pula?

Pair Zerostrasse with the Historical and Maritime Museum in Kaštel or the Pula Aquarium. Pula stays lively off-season, with concerts and a festive Advent market in December.

Stay close to Pula

Arena Stoja Campsite sits on the Stoja peninsula, right next to Pula. City bus no. 1 stops in front of the campsite and takes you to the centre in a few minutes, so you can leave the car behind. It is open all year, so Zerostrasse fits perfectly into a winter camping break. Choose a pitch or one of the Arena Stoja Camping Homes, and bring your dog too, as the campsite is dog-friendly.

Frequently asked questions

What is Zerostrasse in Pula?

A network of Austro-Hungarian WWI tunnels beneath Kaštel hill, now open to visitors as a museum site.

What are the opening hours?

9:00 - 21:00 from 1 May to 30 September, and 9:00 - 17:00 from 1 October to 30 April.

How much are tickets?

Adults 8 €, children 5 - 16 years 3 €, with discounts for students, seniors and groups. One ticket includes Kaštel.

How long does a visit take?

30 - 60 minutes for the tunnels, and more if you add Kaštel and the museum.

Is Zerostrasse a good idea on a hot or rainy day?

Yes. It is indoors and cool, never above about 20 °C.

How do I get there from Arena Stoja Campsite?

Take city bus no. 1 from the stop in front of the campsite to the centre of Pula, then walk to Carrarina 3 near the Twin Gates.

Is it accessible?

Please contact the museum on +385 52 211 566 to confirm access for your needs.

Where is the entrance?

Carrarina 3, near the Twin Gates in the centre of Pula.

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