ISRO chief K Sivan spoke to NDTV on the manned mission to space and said the design phase of it is over. Four IAF pilots have been selected for the mission who have already undergone medical tests and will undergo astronaut training in Russia and India. Mr Sivan did not disclose the identities of the pilots. He, however, said that the pilots were healthy and fit and thus they were selected. The ISRO chief also said they have a longer list of candidates and will discuss if any problem arises with the top four.