In 1995, a dormant volcano erupted and the lava, rocks and ash covered a Caribbean city; two years later it became the world’s only buried ghost capital

In Montserrat, a small island in the Caribbean, there is a capital city that no longer functions as a city. There are no government offices operating there, no residents returning to their former neighbourhoods and no ordinary urban activity. Instead, much of the southern settlement remains covered by volcanic deposits, while the island's administration operates from another part of the territory. The name of this unusual capital is Plymouth.

To understand why a modern Caribbean capital disappeared, the story goes back to 1995, when Soufrière Hills began showing signs of an eruption after centuries without a recorded historical eruption.

Where is Montserrat and why is Plymouth important?

Montserrat is a small British Overseas Territory in the eastern Caribbean, part of the Lesser Antilles. It lies south-west of Antigua and is a volcanic island formed by a chain of volcanic centres. Plymouth was located on the south-western coast and served as Montserrat's capital and the centre of government and commerce. Before the eruption, the island had roughly 10,000 to 11,000 residents, and Plymouth was part of a functioning community rather than an isolated settlement.

The southern part of Montserrat contained much of the island's infrastructure, including the capital, airport and other facilities. That geography became critical when Soufrière Hills became active.

Soufrière Hills had been dormant for centuries

Soufrière Hills is a volcano in the southern part of Montserrat. According to the Montserrat Volcano Observatory, it became active in 1995 after about 400 years of dormancy.

The crisis began on July 18, 1995, when the volcano produced phreatic explosions. These are steam-driven explosions that occur when groundwater is heated by magma or volcanic material. Scientists soon found evidence that magma was moving beneath Soufrière Hills.

A lava dome began forming later that year, a mound of very thick lava that built up around a volcanic vent. Unlike runny lava that can flow relatively easily, the viscous magma involved in dome-building eruptions tends to accumulate. The dome can become unstable and collapse, producing pyroclastic flows. These flows became the main threat to Montserrat.

Why the volcano was so destructive

Pyroclastic flows are among the most dangerous volcanic hazards. They consist of hot gases, ash and fragments of rock that can move rapidly down the slopes of a volcano. At Soufrière Hills, the repeated growth and collapse of the lava dome produced these flows and other volcanic hazards over an extended period.

By 1996, authorities had begun evacuating communities in the south. The Montserrat Volcano Observatory records that the first pyroclastic density currents reached the sea in May 1996.

1997 was the year Plymouth was effectively lost

The eruption became particularly violent in 1997. On June 25, 1997, a major collapse of the lava dome generated pyroclastic flows that moved into populated areas. Nineteen people were killed, and between 100 and 150 houses were damaged or destroyed.

In August 1997, pyroclastic flows reached central Plymouth. More collapses of the lava dome followed, sending ash, rocks and other volcanic material over the southern part of the island.

On September 21, another major dome collapse destroyed Bramble Airport, which had been Montserrat's main airport. The eruption continued producing explosive activity and heavy ashfall in the months that followed. Plymouth was progressively buried by volcanic deposits.

What does it mean for a city to be “buried”?

The word “buried” is not simply a dramatic description. The British Geological Survey says Plymouth was buried by repeated pyroclastic density currents and tephra falls from Soufrière Hills. Lahars, or volcanic mudflows, also affected the area and helped reshape the landscape and coastline.

This means the former capital did not merely become empty and deteriorate over time. Layers of volcanic material physically covered parts of the urban landscape. Buildings, roads and other infrastructure were damaged, buried or destroyed. The southern landscape of Montserrat was fundamentally altered.

The population crisis was enormous

The loss of Plymouth was accompanied by a much larger human displacement.

A UK government evaluation of the volcanic crisis found that by December 1997, approximately 90% of Montserrat's resident population of more than 10,000 had relocated at least once, while more than two-thirds had left the island. The report also said virtually all important infrastructure had either been destroyed or put out of use in the short to medium term.

The World Bank described the eruption as an extreme example of the impact a disaster can have on a small economy. Its assessment recorded 32 fatalities, evacuation of around 70% of the population, and a severe economic contraction. Real GDP fell by 18.5% in 1997 and declined again in 1998. The effects were therefore much broader than the loss of one city.

Montserrat lost homes, businesses, infrastructure, agricultural land and much of its southern economic base. Many residents migrated to the United Kingdom, North America and other Caribbean destinations.

Brades became the practical capital

Once Plymouth was no longer habitable, Montserrat had to move its administrative centre. Brades, in the north-west of the island, became the de facto seat of government and its headquarters remain there today. Yet Plymouth remains the official capital.

That is the unusual contradiction at the centre of its story: Montserrat's capital exists officially in a place where the government no longer operates.

Why has Plymouth never been rebuilt?

The answer is not simply that the city was too badly damaged but that the volcano remains an active hazard. The Montserrat Volcano Observatory currently places the island at Hazard Level 1, but says there is no public access to Zone V, including Plymouth.

Montserrat's government says Plymouth has remained abandoned since 1997 because of continuing volcanic activity.