According to academy sources, the trainee officer was shifted to a private hospital in Banjara Hills, where he was declared dead.
The party was held to mark the completion of training and it continued till midnight. After the party, he went to the swimming pool along with another trainee officer.
It was immediately not clear how Manu drowned.
NPA director Aruna Bahugana ordered an internal probe into the incident.
Rajendernagar police station under Cyberabad police commissionerate registered a case and launched an investigation.