Actually a manhole cover might have preceded the pellets, and Sputnik too, on August 27.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Operation_Plumbbob#Propulsion_of_steel_plate_cap" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Operation_Plumbbob#Propulsion_...</a>