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During 15 years, Luis Fernando Sánchez Caicedo dedicated himself to civil rights in Colombia, aiding young people and championing Afro-descendant and campesino – rural farmer – communities in the Pacific region. A prominent local leader and consultant to the area’s administration in Nariño, he was also a longtime partner with the Institute for Development and Peace Studies, working to promote dialogue in a country divided by decades of war.

That all ended in September when the boat carrying him and the mayor of Mosquera, Karen Lizeth Pineda, was fired on, reportedly by the Colombian navy. Sánchez was killed and the mayor’s bodyguard was severely wounded in the attack.

The incident, which is under investigation by the Colombian authorities, has added to the concern within the local community about a project to turn nearby Gorgona island into a military base.

Creatures such as the marbled poison frog comprise the island’s highly diverse fauna.

Gorgona’s marine protected area (MPA) is at a crossroads, with the construction of a coastguard station, supported by the Colombian navy and backed by the US government, that critics say could threaten 40 years of hard-won environmental progress.

The £1.4m project, which is being funded by the United States, includes a pier, radar and buildings for navy personnel. It is expected to produce 587kg of debris during construction, a large part of which is considered hazardous.

Campaigners say Gorgona has one of the most pristine MPAs in the region. It is a haven for biodiversity, as its natural reserve comprises more than 60,000 hectares (150,000 acres), a third of the area of Greater London.

Before being designated a national park in 1984, it was an high-security prison. Now, it is home to several marine species and ensures food security for coastal communities.

The high-security prison that was on Gorgona Island until 1984

Prof Alan Giraldo, a biologist at Valle University in Cali, who first visited the island in 1989, says: “The purpose of this area is preservation – and having military personnel beside experts and tourists contradicts this idea.”

Marine parks such as Gorgona contribute to the “30x30” global agreement to conserve 30% of land, water and ocean by 2030, as described in the Convention on Biological Diversity.

According to the Protected Planet database, a joint project of the UN Environment Programme and the International Union for Conservation of Nature, Colombia is formally conserving 41% of its marine territory, reaching the 30% target years ahead of schedule.

However, according to the more detailed Marine Protection Atlas complied by the Marine Conservation Institute (MCI), only 6.7% of those waters are “fully” or “highly” protected.

Gorgona’s MPA falls into this much limited category due to the ecological restoration it has experienced in recent years. Nature has recovered: large trees tower over an unused prison compound, whales are regularly seen swimming along the coast, and the surrounding coral reef is the most extensive and biodiverse in the eastern tropical Pacific Ocean.

Humpback whales off Gorgona. They travel from the Antarctic to the warm seas around the island to reproduce between June and October

Its achievement is not coincidental. Strict conservation measures, such as a prohibition on fishing, a ban on tourist boats chasing whales, and the complete restriction of terrestrial and marine areas to human activity, have led organisations such as the MCI to award Gorgona a Blue Park award in June.

Local people say the choice to base a coastguard station on the island was made without informing them, which has heightened a sense of marginalisation from the decision-making process and fuelled opposition.

Mercedes Colorado, government secretary of El Charco, a municipality on the mainland near Gorgona, says: “This project to set up a military base was not consulted with any of the municipal authorities, Indigenous territories or the [Afro-descendant] community councils.”

The radar mast, part of the coastguard project, seen at the top of Trinidad Hill on Gorgona. The Colombian army is also constructing a pier and barracks on the island

The Colombian government says the coastguard station and its radar are essential for fighting drug trafficking and illegal fishing. However, scientists and activists fear the base could make Gorgona a military target in an area already known for armed conflict.

Attacks on Colombian military infrastructure have become increasingly frequent in recent years. In August, 18 people were killed in two separate attacks, including a car bomb at a military aviation school in Cali and a unmanned aerial strike on a police helicopter in Medellín.

US naval forces have built up in the southern Caribbean Sea off Colombia and Venezuela, and President Trump has authorised the non-judicial use of military force against drug cartels in the region. Since early September, US attacks on boats reportedly carrying drugs have killed more than 80 people, according to Pentagon figures.

Tensions between the two countries are growing, as the US has enforced penalties on Colombia, accusing President Gustavo Petro of allowing drug cartels to prosper. Petro sees the US move as an attempt to affect Colombia’s forthcoming elections.

Back in El Charco, Colorado says: “We know that Trump’s policy involves deploying military forces to other countries to assume command of territories that aren’t theirs.”

A memorial service held after the Cali attack, which killed six people and injured more than 60

Whether the US will ultimately place military personnel on the island is uncertain. Yet its participation is evident as the Bureau of International Narcotics & Law Enforcement, a branch of the US state department, was in charge of the pier’s design and the vessels assigned for the Colombian coastguard.

Experts fear the new construction could also affect the island’s recently restored ecosystem, as the pier could increase sedimentation and change water flows, potentially damaging the coral reef and compromising the health of the seabed.

The Colombian navy’s environmental impact assessment has recognised possible effects, including the loss of soil structure, fertility and stability, as well as potential damage to fish, turtles and marine mammals. The project also includes a 20,000-litre fuel tank that must be shipped by boat from the mainland and could leak fuel into the ocean.

For a biologist such as Giraldo, the project “endangers ecosystems that have developed over hundreds of years and could be destroyed in a second”.

Blue-and-gold snappers and a sergeant major in the reef off Gorgona. Thanks to preservation work in recent decades, the coral is the eastern tropical Pacific’s most extensive and biodiverse

Although the navy has insisted that the pier construction will consider the whale season to avoid disruptions, it is unclear how this will be implemented, as the environmental assessment suggests that the pier construction would take more than nine months. That leaves only 76 days of the year unaffected, while the whale mating and breeding season takes place between June and October, amounting to more than 100 days.

Fishers, as well as scientists, also are concerned about the navy’s new limitations on their movements and fear being confused for the military by armed groups when fishing at night. They fear that the navy will limit when they can fish or even whether they can enter the island at all.

A fishing boat from Bazán village. Some fear that as Gorgona becomes militarised, the waters around the island will be off-limits. ‘This base could mean the death of fishers,’ says one man

Although local communities are not permitted to fish within the MPA, they are allowed to use an approved shelter to stay on the island periodically.

“That all creates a risk now,” says Espaciano Aguirre, a experienced fisherman. “This base could mean the death of fishers.”

Besides the security risk highlighted by the killing of Sánchez, the coastguard project could endanger the island’s Blue Park recognition. According to Dr Sarah Hameed, director of Blue Parks at the MCI, the organisation was entirely uninformed of the coastguard project.

“Any project that poses a threat to biodiversity conservation … can trigger the early re-examination of the five-year review,” Hameed says.

If the MCI were to decide that the coastguard station clashes with the conservation criteria of the Blue Parks initiative, this could mean that the Gorgona marine protected area loses its international recognition, weakening Colombia’s 30x30 ambitions.