ISTRAC at Bangalore on January 19, 2007. The critical de-boost operations were executed from SCC, Bangalore supported by a network of ground stations at Bangalore, Lucknow, Sriharikota, Mauritius, Biak in Indonesia, Saskatoon in Canada, Svalbard in Norway besides shipborne and airborne terminals. On January 22, 2007, the re-orientation of SRE-1 capsule for de-boost operations commenced at 08:42 am IST. The de-boost started at 09:00 am with the firing of on-board rocket motors and the operations were completed at 09:10 am. At 09:17 am, SRE-1 capsule was reoriented for its re-entry into the dense atmosphere. The capsule made its re-entry at 09:37 am at an altitude of 100 kilometers with a velocity of 8 km/s (ca. 29,000 km/h). During its reentry, the capsule was protected from the intense heat by carbon phenolic ablative material and silica tiles on its outer surface. By the time SRE-1 descended to an altitude of 5 km, aerodynamic braking had considerably reduced its velocity to 101 m/s (364 km/h). Pilot and drogue parachute deployments helped in further reducing its velocity to 47 m/s (169 km/h). Splashdown and recovery The main parachute was deployed at about 2 km altitude. SRE-1 splashed down in the Bay of Bengal with a velocity of 12 m/s (43 km/h) at 09:46 am IST (04:16 am UTC). The flotation system, which was immediately triggered, kept the capsule afloat. Recovery operations were supported and carried out by the Indian Coast Guard and Indian Navy using ships, aircraft and helicopters. Experiments and results During its stay in orbit, the following two experiments on board SRE-1 were successfully conducted under microgravity conditions. One of the experiments studied metal melting and crystallisation under microgravity conditions. This experiment, jointly designed by the Indian Institute of Science, Bangalore and Vikram Sarabhai Space Centre, Thiruvananthapuram, was performed in an isothermal heating furnace. The second experiment, jointly designed by National Metallurgical Laboratory, Jamshedpur and ISRO Satellite Centre Bangalore, studied the synthesis of nano-crystals under microgravity conditions. This was an experiment in designing biomaterials that better replicate natural biological products. The experimental results have yet to be analysed. Performance of Silica TPS tiles in conical region of capsule was satisfactory and tile surfaces were found intact with some minor handling related damage during recovery operations. The spacecraft remained afloat for approximately 2 hours in seawater before recovery, causing minor cracks and seawater deposits on tile surfaces. See also SRE-2 CARE List