I’ve heard this basic story before. Still don’t know if the writer means speed of sound in water or speed of sound someplace else, like, oh, say air? For him to see/hear that he had to have his ear muffs on or maybe watching a strip chart recorder to have a notion of time and distance. His “research” had to already be listening to something outside since there’s nothing otherwise to “hear” inside a nuke. This genius can’t reveal how he observed the speedy thing without also revealing what he was testing/observing/operating. I still have one hand on the BS flag until we get a couple specifics. Testing hypersonics underwater comes to mind but there is nothing quiet about that bit of hocus pocus?
There are way too many 'huh' items in this story in this story as it is.
SpyNavy
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)