Om Prakash Kanojia, accused of raping and murdering an 18-year-old student at a girl's hostel in south Mumbai Tuesday, had shinned up a drainage pipe in a duct at the back of the building to the first floor, climbed in through a gap and taken the stairs to the fourth floor where the girl was alone, said investigators.

from Times of India https://timesofindia.indiatimes.com/city/mumbai/hostel-murder-guard-climbed-up-drain-pipe-to-access-4th-floor/articleshow/100861035.cms