Chrysalis Base was a secret installation located underground beneath the desert region of Rajasthan in India, which housed the Chrysalis Project. The base was built in the 1960s, and destroyed May 18, 1974.
The base was destroyed by a nuclear detonation by Aegis agents Gary Seven and Roberta Lincoln. Prime Minister Indira Gandhi of India later claim this was "a peaceful nuclear explosion experiment" in order to cover up the existence of the base and project. (ST - The Eugenics Wars novel: The Rise and Fall of Khan Noonien Singh, Volume 1)