Interesting video of explosion at Engels Airbase. At 15 sec, sound of something passing overhead. At 42 sec, light from explosion. 19 secs later - sound of blast, about 6.2 km away (speed of sound 326.34 m/s, dry air -8 C.) pic.twitter.com/rJ897Sv3Wv

— Euan MacDonald (@Euan_MacDonald) December 5, 2022