The Ayalon Institute (Hebrew: מכון איילון, romanized: Makhon Ayalon) was an underground ammunition factory, located on Kibbutz Hill in Rehovot, Israel, disguised as a kibbutz that ran a laundry service. The factory was established in 1945 and manufactured ammunition until 1948; today it is a museum and national historical site. It was “secretly created in less than a month, 8 meters (25 feet) underground and was run by the Haganah".