Newly released data from ground-based radar came out Tuesday suggesting an Army helicopter was higher than it was supposed to be when it collided with American Airlines Flight 5342 a week ago, killing all 67 people aboard both aircraft.

Diving crews are still searching the icy waters of the Potomac River looking to retrieve the bodies of all the people killed in this week’s plane and helicopter collision. Retired Black Hawk instructor pilot Martin Gottholm discusses the difficulties in flying at night for Black Hawk pilots and questions surrounding the altitudes of the aircrafts at the time.