Sergey Ryzhov, Genaddi Binuk and Nikolai Trunov, three of five Russian Hydropress nuclear specialists killed in the crash of a Tupolev 134 in Petrozavodosk on June 23 designed the Iranian nuclear plant in Busheshr. Valery Lalin and Andrei Tropinov, two other engineers, had also been working for Hydropress on securing the Iranian plant to withstand a natural disaster. Hydropress is one of the member companies of Russia’s State Nuclear Corporation. It is one of the main companies involved in the construction of the Bushehr nuclear power plant, and is also involved in projects in China, India and Bulgaria. The cause of the crash that killed a total 45 passengers and crew remains unknown.