Shanmuga Subramanian, the Chennai-based engineer who has been credited by NASA after he alerted them about the presence of the debris of the lander of Chandrayaan 2, said he had alerted both the US space agency and the Indian Space Research Organisation. The 33-year-old told NDTV that he got a good response from the scientists at NASA. "I did send a tweet to NASA and ISRO. I sent emails to a couple of NASA scientists. They were in charge of the LRO (Lunar Reconnaissance Orbiter) images. I got a good response from them," Mr Subramanian told NDTV.