Fulfilling their promise to confront and attempt to stop a Russian oil company’s first shipment of arctic oil from reaching mainland Europe, more than 80 activists from Greenpeace on Thursday attempted to block the oil tanker Mikhail Ulyanov from docking in the Dutch port city of Rotterdam.

According to early reports, at least 30 members of the Greenpeace team have been arrested by Dutch officials.

Supported by the group’s flagship the Rainbow Warrior III, a fleet of inflatable rafts, and a paraglider circling above, the international team of environmentalists—who say protecting the Arctic from drilling is vital in protecting the region’s fragile ecosystems and battling planetary climate change—delivered a clear message from above and below: ‘No Arctic Oil.”

One group of activists painted “No Arctic Oil” in large letters on the hull of the tanker, while other activists in inflatables put themselves between the quay wall and the tanker in order to keep it from landing.

The oil inside the Mikhail Ulyanov is the very first shipment from an Arctic oil field drilled by Russian oil giant Gazprom and its delivery to Europe, says Greenpeace, marks the beginning of a terrifying new chapter in the history of extraction.