Bengaluru, June 27 -- Indian Space Research Organisation (ISRO) Chairman V Narayanan on Saturday said that recent propulsion-related testing marked a "major achievement and milestone," while stressing that the Gaganyaan mission remains highly technology-intensive and will involve multiple uncrewed missions before human flight.

Referring to recent successful hot test of the Semi-Cryogenic Engine Power Head Test Article (PHTA) at a thrust level of 175 Tonne, Narayanan said, "a test that was conducted, excluding the thrust chamber...we have taken close to 90% of the thrust load...it was a major achievement and milestone, and now we are getting ready for the engine test...satellites are ready, and we are working on that, an exact date will b...