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 {|cellspacing=10 cellpadding="15" width="100%" border="0" Kontakt (figure 1-15). The docking system was to be used only once during the mission, after the L3 had completed its lunar landing mission and returned to orbit. Little docking accuracy was required to link the spacecraft firmly enough to let the moonwalking cosmonaut return to the L2 by EVA.
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 * Made no provision for internal crew transfer after docking.
 * Orbital module had an EVA hatch larger than the one on the Original Soyuz.
 * Electronics more complex than those on the Original Soyuz, in keeping with its more demanding mission.
 * width="33.3%" rowspan="2" colspan="1"| [[image:Mir-17.jpg|250px]]
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 * Oxygen/hydrogen fuel cells and batteries replaced the solar arrays of the Original Soyuz.
 * Descent module had a heat shield thicker than that of the Original Soyuz, permitting it to withstand reentry at lunar return speeds.
 * width="33.3%" rowspan="1" colspan="1"|Figure 1-15. Kontakt docking system. Never used in space, the system was designed for the Soviet lunar program. The Aktiv unit (top) was located at the front of the L2, while the passive unit was located on top of the L3 lander.
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1.5.3 L2 Mission Descriptions
None of the planned L2 missions reached orbit.