Russia's Interfax News Agency reports that engineers at the All-Russian Research Institute of Experimental Physics (RFNC-VNIIEF)—the Russian Federation Nuclear Center facility where scientists designed the Soviet Union's first nuclear bomb—have been arrested for mining cryptocurrency with "office computing resources," according to a spokesperson for the Institute. "There has been an unsanctioned attempt to use computer facilities for private purposes including so-called mining," said Tatyana Zalesskaya, head of the Institute's press service.

Zalesskaya did not say how many people were detained, and the Federal Security Service (FSB) has not issued a statement on the arrests or criminal charges pending. But reports indicate that the group was caught trying to harness the lab's supercomputer to mine cryptocurrency.

The Institute is located in Sarov, a "closed" city east of Moscow where nuclear weapons research has been conducted since 1946. The facility is so secret that it was left off Soviet maps; Sarov is surrounded by fences and guarded by the Russian military accordingly. While the city is the home of Russia's Nuclear Weapons Museum, don't plan a visit anytime soon—access to Sarov is restricted, and no one who does not live in the city is allowed to visit without permission. Foreigners visiting on official business have to surrender their passports, cell phones, and other electronic devices at the city's checkpoints.

Because of the nature of the work at the Institute, technically none of the Institute's computers—including its 1-petaflop capable supercomputer, used for simulating tests of nuclear weapons designs—is supposed to be connected to the Internet. According to the Russian news service Mash, someone at the Institute attempted to connect the supercomputer to the Internet, and that attempt was detected by the FSB, launching an investigation.

Cryptocurrency speculation and mining have generated so much interest in Russia that one businessman—Alexey Kolesnik—recently bought two power plants in the Russian republics of Perm Krai and Udmurtia to be used exclusively to generate electricity for Bitcoin-mining data centers. But there have been numerous other attempts recently in Russia to harness corporate and industrial computer systems for illicit cryptocurrency mining as well.

Zalesskaya told Interfax that a large number of companies "with large computing capacity" have recently experienced attempts to harness their computing infrastructure for cryptocurrency mining, but the PR rep told Interfax that these sorts of schemes "will be severely suppressed at our enterprises. This is technically a hopeless and criminal offense."