Satellite images show major expansion at Russian site with secret bioweapons past

A few months after Russia began its full-scale invasion of Ukraine in 2022, satellite imagery captured unusual activity at a restricted military research facility nestled among the birch forests northeast of Moscow.

The Russian site, called Sergiev Posad-6, had been quiet for decades, but it had a notorious Cold War past: It had once been a major research center for biological weapons, with a history of experiments with the viruses that cause smallpox, Ebola and hemorrhagic fevers.

Satellite imagery over the next two years — collected by Google Earth and commercial imaging firms MAXAR and Planet Labs — shows construction vehicles renovating the old Soviet-era laboratory and breaking ground on 10 new buildings, totaling more than 250,000 square feet, with several of them bearing hallmarks of biological labs designed to handle extremely dangerous pathogens.

There has been no sign such weapons have been used in the Ukraine conflict, but the construction of new labs at Sergiev Posad-6 is being closely watched by U.S. intelligence agencies and bioweapons experts amid worries about Moscow’s intentions as the conflict grinds through its third year.

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