Detonation of BNSF Iowa side span over the Big Sioux River

Drone video on September 6, 2024, a planned explosion of the Iowa side span of the damaged BNSF bridge over the Big Sioux River. My microphone was set up at the point of drone launch, which was about 1,100 feet from the point of detonation. About one second of audio was removed to synchronize the sound with the video. The One Minute Warning Siren can be heard at about 3 minutes 44 seconds. The microphone picked up a bit of wind noise even though the wind seemed calm.