As thousands of datacentres are constructed across Europe, the Guardian and Investigate Europe have uncovered disturbing evidence that some workers building them are exposed to dangerous conditions and living in fear of speaking out

Sandu* checked his watch. He was winding down the last 15 minutes of his shift at a vast Google datacentre site in Saint-Ghislain, Belgium, in March, when the call came in. The 34-year-old electrical tester had already worked almost 10 hours, but says such last-minute jobs were normal: “I had no choice. People have been fired after saying no.”

The task was one Sandu had done many times before and involved a series of tests measuring the safety and integrity of the electrical wiring. A protective suit was locked away in an equipment room. The round trip would have added another 15 minutes to the job, he says, and people were waiting, so he decided not to retrieve the suit.

As thousands of datacentres are constructed across Europe, the Guardian and Investigate Europe have uncovered disturbing evidence that some workers building them are exposed to dangerous conditions and living in fear of speaking out

Sandu* checked his watch. He was winding down the last 15 minutes of his shift at a vast Google datacentre site in Saint-Ghislain, Belgium, in March, when the call came in. The 34-year-old electrical tester had already worked almost 10 hours, but says such last-minute jobs were normal: “I had no choice. People have been fired after saying no.”

The task was one Sandu had done many times before and involved a series of tests measuring the safety and integrity of the electrical wiring. A protective suit was locked away in an equipment room. The round trip would have added another 15 minutes to the job, he says, and people were waiting, so he decided not to retrieve the suit.

Authorities allege company may have breached Finnish environmental laws by forgoing required impact assessment

• ‘Pure arrogance’: anger in Finland as Google illegally fells 250,000 trees for datacentre

Finnish ⁠police have launched a criminal investigation into possible breaches ⁠of the country’s environmental ⁠laws ​at the site of a planned Google datacentre in rural northern Finland.

Authorities allege that Tuike Finland, a Google subsidiary, cleared and drained 330 hectares (815 acres) of forest at the planned site in Muhos before environmental impact assessments required by Finnish law had been completed.

Authorities allege company may have breached Finnish environmental laws by forgoing required impact assessment

• ‘Pure arrogance’: anger in Finland as Google illegally fells 250,000 trees for datacentre

Finnish ⁠police have launched a criminal investigation into possible breaches ⁠of the country’s environmental ⁠laws ​at the site of a planned Google datacentre in rural northern Finland.

Authorities allege that Tuike Finland, a Google subsidiary, cleared and drained 330 hectares (815 acres) of forest at the planned site in Muhos before environmental impact assessments required by Finnish law had been completed.

Company ordered to stop work at two sites in country, which has found itself at forefront of tech firms’ latest push

Behind a wire fence lies a vast gaping wound of earth. Before Google’s arrival a few months ago, an estimated quarter of a million trees occupied the 330 hectares (815 acres) of forest near the town of Muhos in rural northern Finland. Now they are all gone.

After the tech company illegally stripped the entire area to build a datacentre – taking even the top soil with it – all that remains is a vast expanse of mud indented with the trail marks of machinery, puddles and mounds of earth, roots and branches. Residents say that brown water flowing off the site is going into a stream that feeds the Oulujoki River.