The five passengers who perished in the East River helicopter crash Sunday all died from drowning, the Office of the Chief Medical Examiner announced Tuesday.

Daniel Thompson, 34, Tristan Hill, 29, Trevor Cadigan, 26, Brian McDaniel, 26, and Carla Vallejos Blanco, 29, were all strapped into harnesses so they could dangle their legs outside the FlyNYON chopper and take photos.

But they were unable to free themselves from the devices when it hit the water and rescue divers later had to cut them out, according to FDNY officials.

Pilot Richard Vance was just in a standard seatbelt, according to Eric Adams, who was on a simultaneous FlyNYON sightseeing tour.

Vance was able to free himself from the sinking craft and survived.