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Almost five millennia ago, hundreds of engraved, disc-shaped stones were deposited in a giant pit at the Neolithic Vasagård site on the small Danish island of Bornholm.

Climate scientists from the Niels Bohr Institute at the University of Copenhagen in Bornholm analyzed ice cores from Greenland’s ice sheets and demonstrated that a major volcanic eruption occurred on the island 2,900 years ago.

"Residents deposited them in ditches forming part of a causewayed enclosure together with the remains of ritual feasts in the form of animal bones, broken clay vessels, and flint objects around 2,900 BC," archaeologist Rune Iversen from the University of Copenhagen, who previously participated in site excavations led by the Museum of Bornholm and the National Museum, said in a statement.

At the end of September 2022, the Nord Stream gas pipeline on the bottom of the Baltic Sea exploded east of Bornholm and one of the largest unnatural methane gas emissions ever was a fact.

In September 2022, leaks were discovered in three of the four gas lines east of the Danish island of Bornholm in the Baltic Sea.