of 9.6 tonnes. At the time, this was the heaviest payload to be launched by a Proton rocket. The automatic docking system was unable to dock the module completely with Mir on the first attempt. On April 5, the crew of EO-2 retreated to their lifeboat, Soyuz TM-2, in case the module lost control. The module drifted 400 km from the station before it was guided back of a second docking attempt, and on April 9 a partial docking between Kvant and Mir occurred. To determine the problem with the Kvant docking, both Romanenko and Laveykin took part in an emergency spacewalk on April 11. On the spacewalk they discovered some debris, probably a trash bag, was preventing the spacecraft from fully docking. The spacewalk lasted 3 hours and 40 minutes. With the problem fixed, on April 11 Kvant achieved a complete docking to Mir. The next day the FSM was undocked from Kvant, as it was no longer needed, and it was placed in a parking orbit 41 km above Mir; over a year later it underwent uncontrolled reentry. April to July 1987 The crew first entered the Kvant-1 module on 13 April, when they began unloading equipment. On 23 April the next Progress spacecraft docked with the station via Kvant's rear docking port, where the FSM used to be. Progress 29 had a mass of 7,100 kg, and undocked from the station on 11 May. During this time Mir was short on electricity, so for most of May the EO-2 crew performed activities that used little electricity, such as medical experiments or Earth observations. On 22 May the next resupply craft arrived, Progress 30, which had a mass of 7,249 kg. It remained docked until 19 July. During June the EO-2 crew performed two spacewalks (EVAs) to install a new set of solar arrays, which would boost the electrical capacity of the station to 11.4 kW. Mir EP-1 The first visitors the EO-2 crew had come in July 1987 aboard the spacecraft Soyuz TM-3. The three man crew launched by TM-3 included the first Syrian astronaut, Muhammed Faris. The crew had originally been scheduled to visit Salyut 7 in 1985, but it was reassigned to Mir. On July 24, the spacecraft automatically docked to the Kvant-1 port, but they had to use a lever to break the hatch's seal. Shortly after the new arrivals floated into the station,