The minimum aircraft altitude permitted for that area was 500 feet (150 m) AGL; during the mission, Holland's aircraft was filmed crossing one ridgeline about 30 feet (10 m) above the ground. Fearing for their safety, the photography crew ceased filming and took cover as Holland's aircraft again passed low over the ground, this time estimated as clearing the ridgeline by only three feet (1 m). The co-pilot on Holland's aircraft testified that he grabbed the controls to prevent Holland from flying the aircraft into the ridge while the aircraft's other two aircrew members repeatedly screamed at Holland: "Climb!