The station also saw two flights of Svetlana Savitskaya making her the second woman in space since 1963 and the first to perform an EVA during which she conducted metal cutting and welding alongside her colleague Vladimir Dzhanibekov.[2] Aside from the many experiments and observations made on Salyut 7, the station also tested the docking and use of large modules with an orbiting space station. The modules were called "Heavy Kosmos modules" though in reality were variants of the TKS spacecraft intended for the cancelled Almaz military space station. They helped engineers develop technology necessary to build Mir.