Denis Baykov, an employee at a Russian nuclear warhead facility, has been fined 450,000 rubles ($7,000) for illegally mining Bitcoin, a Russian court announced last week.

Baykov and two other employees at the All-Russian Scientific Research Institute of Experimental Physics in Sarov, Nizhny Novgorod Region, attempted to mine cryptocurrency using a computer powered by one petaflop, which is equal to 1,000 trillion transactions per second.

Baykov was convicted of illegally accessing the computer and violating rules against storing information. 

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The plot was foiled last February. According to Russian media outlet Meduza, the other two employees implicated in the crime are awaiting sentencing. 

Tatyana Zalesskaya, a spokesperson for the institute, told Russian media outlet RBC at the time that the detainees illegally used “official computing power for personal purposes, including for the so-called mining."

Sarov is a restricted area, protected by guards and barbed wire. The nuclear centre is federally owned. According to the BBC, the USSR’s first nuclear bomb was made at Sarov under Stalin.