Three pen drives that former RAW official Ujjwal Dasgupta allegedly used to transfer sensitive data to US diplomat Rosanna Minchew were recovered from a well in New Delhi’s Nehru Park.

Classified Defence documents on Stegno tease version 1.0 and state-of-the-art software developed by the Faculty of Communication Engineering, Military College of Engineering, Mhow, were recovered from the pen drives by Central Forensic Sciences Laboratory, Chandigarh, the police said.

Dasgupta, the police said, directed them to the well in the park in Chanakyapuri during his police custody. He, they said, had 10 pen drives in his possession.

Dasgupta was former Director of Computers at the Research and Analysis Wing (RAW) and that he was under surveillance and later detention were first reported by The Indian Express. He was arrested on charges of espionage on July 19, after two other employees of National Security Council Secretariat (NSCS), Mukesh Saini and Shib Shanker Paul, were held.

He was remanded to police custody for seven days and on July 25, sent to judicial custody. The police today sought his custody for three more days.

Police sources said a CD allegedly given to him by Minchew and a hard disk of his office computer have also been analysed by the CFSL. He had allegedly met Minchew on several occasions in and outside the Capital.