It was estimated that 25 metric tons of liquid nitrogen per day would be required to keep the soil frozen at −100 °C. This idea was soon scrapped and the bottom room where the cooling system would have been installed was filled with concrete.
Estimouse que se precisarían 25 toneladas métricas por día para manter o chan conxelado a −100 °C. Esta idea foi rexeitada ao pouco tempo, e a sala do fondo onde se instalara o sistema de refrixeración encheuse con cemento.