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.

Elizabeth Warren and others joined by unions and industry experts in warning against the weakening of regulations

The senator Elizabeth Warren, the congresswoman Ilhan Omar and several other Democratic lawmakers are calling on the Occupational Safety and Health Administration (Osha) to abandon a rollback of respirator mask regulations, a change the lawmakers say would weaken worker protections against hazardous substances.

Under the proposed rules, employers would face fewer requirements to provide workers with respirators masks when working with substances including “lead, asbestos, formaldehyde and inorganic arsenic, among other chemicals”, the lawmakers wrote in a letter to the Osha assistant secretary, David Keeling, a former UPS and Amazon executive.