The Secret Tunnels of Vis

Inside the Cold War military landscape hidden beneath Vis

Today, Vis is known for clear water, vineyards, stone villages and a slower rhythm of island life. But beneath its peaceful landscape lies another story.

Across the island are tunnels, bunkers, coastal positions and underground shelters built during the decades when Vis was one of Yugoslavia’s most strategically important military locations.

For much of the Cold War, access to the island was restricted for foreign visitors. Its position in the central Adriatic made Vis an important part of Yugoslavia’s coastal defence system, and military infrastructure became embedded in the landscape.

Many traces of that period remain today.

A Strategic Island in the Adriatic

Vis has been valued for its strategic position for centuries, but its military importance became particularly pronounced during and after the Second World War.

In 1944, Josip Broz Tito and the Yugoslav Partisan leadership operated from Vis for a period while the island served as an important Allied and Partisan base in the Adriatic.

After the war, Vis became part of socialist Yugoslavia. Its location far from the mainland and close to important shipping routes gave it exceptional military significance.

Academic research into the island’s post-war development describes Vis as being regarded by Yugoslav authorities as the “key of the Adriatic.”

During the following decades, military installations were established across the island, including underground shelters, tunnels, bunkers, observation positions and coastal defence facilities.

For visitors today, these remains reveal a very different Vis from the island of beaches and restaurants seen at first glance.

An Island Closed to Foreign Visitors

One of the most unusual consequences of Vis’s military importance was its isolation.

Foreign tourism developed rapidly along much of the Croatian Adriatic during the Yugoslav period, but Vis remained heavily restricted.

For decades, foreign visitors could not simply travel to the island as tourists.

This had a profound effect on Vis.

While destinations elsewhere on the Dalmatian coast developed large hotels and mass tourism infrastructure, Vis remained comparatively isolated. The island’s economy and population were also affected by the strong military presence and the restrictions associated with it.

Foreign visitors were finally allowed to return in 1989, shortly before the breakup of Yugoslavia.

This unusual history helps explain why Vis still feels different from many other Adriatic islands today.

Beneath the Landscape

The military infrastructure of Vis was designed to use the island itself as protection.

Rock and hills provided natural cover, while underground construction allowed personnel, equipment and military assets to be concealed from observation and protected from attack.

Rather than one single tunnel system, Vis contains numerous separate military sites created for different purposes.

Some were connected with coastal defence. Others provided shelter, storage, command facilities or protected positions for military personnel and equipment.

Many entrances are surprisingly discreet. A dark opening in a hillside or an apparently ordinary concrete structure can lead into spaces hidden deep inside the rock.

Decades after their military role ended, these structures remain among the most unusual physical reminders of the Cold War on the Croatian coast.

The Naval Tunnel at Parja Bay

One of the most impressive surviving military structures can be found in the area of Parja Bay, near Rogačić, northwest of Vis Town.

Here, a large tunnel was cut directly into the rock with an entrance from the sea.

The structure was created as a protected naval shelter, allowing military vessels to enter from the Adriatic and remain concealed inside the island.

Seen from the water, the entrance is extraordinary: a dark opening in the limestone where the sea disappears beneath the hillside.

The Vis Tourist Board identifies the naval tunnel as one of the principal sites associated with the island’s former military areas.

Today, it is one of the most recognisable remnants of Yugoslavia’s military presence on Vis.

Coastal Defence at Stupišće

The area around Cape Stupišće, near Komiža, contains another important concentration of military remains.

The site formed part of the island’s coastal defence network and included gun positions, bunkers, underground spaces and supporting military infrastructure.

Its location demonstrates the strategic logic behind the military use of Vis. From elevated positions around the island, forces could observe and defend approaches through the surrounding Adriatic.

Today, the abandoned structures stand in striking contrast to the Mediterranean landscape around them.

Concrete, stone and underground passages remain among pine, scrub and exposed limestone — physical traces of a political and military world that disappeared only a few decades ago.

Vela Glava and the Island’s Interior

Military installations were not limited to the coastline.

Sites in the island’s interior, including the area around Vela Glava, formed part of the wider defence infrastructure.

Using elevated and concealed positions allowed the Yugoslav military to spread important facilities across the island rather than concentrating everything along the shore.

The result was a military landscape extending far beyond the most visible coastal fortifications.

Even today, visitors travelling through the interior of Vis may pass former military roads, concrete structures and entrances without immediately recognising their original purpose.

From Military Island to Open Island

The military role of Vis changed dramatically as Yugoslavia began to break apart.

After decades of restrictions, the island opened to foreign tourists in 1989. The Yugoslav People’s Army eventually left Vis in 1992 during the Croatian War of Independence.

An extraordinary transition followed.

Places that had once been secret or restricted became part of the civilian landscape.

Military roads became ordinary roads. Former installations were abandoned. Tunnel entrances that once belonged to a highly controlled defence network gradually became historical landmarks.

Within a remarkably short period, Vis changed from a strategically guarded military island into one of Croatia’s most distinctive travel destinations.

Exploring the Military History of Vis Today

Former military sites have become an important part of understanding the modern history of Vis.

Organised military-history tours visit several locations around the island, often combining underground installations, coastal defence positions and the naval tunnel at Parja.

A guided visit has an obvious advantage: many of the surviving structures make much more sense when their original function and historical context are explained.

It is also the safest way to explore them.

Some abandoned military structures may be unstable, difficult to access, restricted or situated on private land. Visitors should never assume that an open tunnel entrance means a site is safe or publicly accessible.

Do not enter closed or restricted installations, and follow local guidance when exploring former military areas.

More Than a Cold War Curiosity

The tunnels of Vis are fascinating because they reveal how dramatically the identity of an island can change.

The same landscape that visitors now associate with swimming, wine, sailing and quiet stone villages was, within living memory, part of an extensive military defence system.

The tunnels also help explain something deeper about modern Vis.

Its long period of military restriction delayed the development of international tourism compared with many other parts of the Adriatic. While this isolation brought considerable challenges for the people who lived here, it also meant that the island followed a different path from many heavily developed Mediterranean destinations.

Today, the bunkers, tunnels and abandoned positions scattered across Vis are slowly becoming part of the island’s documented history rather than military secrets.

They are reminders of a period when this small island occupied a remarkably important strategic position in the Adriatic — and when much of what lay beneath its hills was deliberately hidden from the outside world.

Visiting the Military Sites

Some former military sites can be visited as part of organised tours, while other abandoned structures may be unsafe, restricted or located on private land. Visitors should not enter closed tunnels or military installations without permission. A guided military-history tour is the safest way to explore the major sites and understand their original purpose.

Sources & further reading

Vis Tourist Board – Visit to the Former Military Areas
Official information on visiting former military sites on Vis, including Vela Glava, the Stupišće fortifications and the naval tunnel in Parja Bay.
Vis Tourist Board – Rogačić Bay
Background on Rogačić and the military naval shelter in the Parja area.
Vis Tourist Board – Tito’s Cave
Background on Tito, the Partisan leadership and the military importance of Vis during the Second World War.
Nejašmić & Mišetić – Population of Vis Island
Academic research discussing the strategic military importance of Vis, its post-war isolation, military infrastructure and restrictions on foreign tourism. Published through Hrčak, the Croatian scientific and professional journals portal.