 The new Soviet space chief Glushko canceled the N1-L3 program in 1974 but proposed the new Vulkan-LEK project for expeditions to the Moon, based on a new superheavy launcher developed by his bureau, but this project was not realized either.Moon expeditions and the construction of a Moon base would have required nearly 50 billion rubles (80 billion US dollars in 1997).All manned Soviet lunar programs, including a Zvezda moonbase, had been classified as top secret and were only published in the glasnost epoch since 1990.