(Yes, that’s ex-Nazi Wernher von Braun above in the silver hard hat and Hawaiian shirt. He led the team that developed the Redstone.) Even at that significant distance, the TEAK explosion’s thermal pulse was so intense that observers on Johnston Island had to scramble for shelter for a few moments:
Hardtack Teak outer space detonationYouTube video by atomcentralwww.youtube.com