From 1945 to 1950, Riehl was in charge of a group at Plant No. 12 in Ehlektrostal', which had been assigned the task of industrializing reactor-grade uranium production.
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After rescue from the Krasnoyarsk PoW camp, he initially worked in Nikolaus Riehl’s group at Plant No. 12 in Elektrostal’, Russia, but at the end of 1947 was sent to work in Sungul' at a sharashka known under the cover name Ob’ekt 0211.