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for preparing the Indian astronauts chosen for the mission, Gavkosmos. In addition to receiving medical and physical training, the four chosen astronauts are also learning Russian, which is regarded as one of the most important languages for space communication. In addition, the candidates for astronaut positions will undergo training in hyperbaric chamber (a pressurized room) and centrifuge simulations to prepare them for spaceflight conditions like G-force, hypoxia, and pressure drops. They would need to become accustomed to gravitational shifts, which will alter their physiological state, so the training would be difficult. During re-entry to earth or landing, changes in gravity can alter blood pressure and occasionally even cause unconsciousness. Astronauts may also face motion sickness while experiencing weightlessness in space.
 The astronauts will receive module-specific training in India after a year of training in Russia. Indian Air Force pilots make up every one of the potential astronauts. The Air Force chose 25 pilots from among them to shortlist. Water Survival Test Facility
 At the Indian Navy's Water Test Survival Facility in Kochi, ISRO and the Indian Navy carried out the mission's recovery trials. The final step of the manned space mission is crew recovery.  For the Gaganyaan mission, the recovery will be carried out in Indian waters by various agencies under the leadership of the Indian Navy. 
 Because the recovery is a time-sensitive event, it needs to be completed immediately. Thus this requires extensive trials, preparation and finalization of Standard Operating Procedures so that all the stakeholders know what their role is in the process.
 WSTF: What is it? It is a Water Survival Test Facility of the Indian Navy which is used to train the aircrew on how to escape a ditched flight under multiple crash scenarios and weather conditions.  It can make the crew well-prepared for any situation by stimulating any sea conditions, environmental conditions, time of day, or other factors. Unmanned Gaganyaan Missions Two unmanned missions are planned in advance of the human space flight mission, as previously mentioned. ISRO will need to finish a lot of tests before the unmanned missions, the most important of which are: Air drop test for the parachute system that will demonstrate the ability to successfully recover an orbiting space capsule.
 Flight test of the test vehicle.
 Abort the test to demonstrate the crew's escape in the event of a launch pad emergency. ISRO has chosen six tests that will be carried out on the first unmanned space mission. A study on the SIRT1 gene in drosophila melanogaster (the common fruit fly), changes in kidney stone formation, microbial contamination, and co-crystallization under microgravity conditions are biological tests.