Top Isro scientist hints at 'espionage attack', claims he was poisoned in 2017 Top Isro scientist hints at 'espionage attack', claims he was poisoned in 2017 Top Isro scientist Tapan Misra has alleged that he was poisoned with deadly arsenic trioxide on May 23, 2017 during a promotion interview at Isro headquarters in Bengaluru. advertisement Tapan Misra is currently a senior advisor at Isro. (Photo: Facebook/TapanMisra) The Indian Space Research Organisation (Isro) is in the news again but this time it is not for a healthy reason. A senior Isro scientist has claimed that he was poisoned more than three years ago. He has also hinted that this could be an "espionage attack" to kill a top scientist involved in important military-related projects.