 The NYPD Aviation Unit operates night vision-equipped Bell 412 helicopters which fly to rescue locations carrying two pilots, one crew chief and two scuba divers.NYPD motor lifeboats from the Harbor Unit respond as well, meeting the helicopter at the incident site to pick up non-critically injured survivors who don't require air evacuation.After the January 2009 ditching of US Airways Flight 1549 in the Hudson River, NYPD air-sea rescue units pulled two survivors from the icy river and applied first aid for hypothermia, and divers swam through the submerged aircraft cabin to make certain all passengers were evacuated.