I would think that it would still need to detonate at a specific depth or when it hits a hollow area in order to be effective.
Detonating at the desired depth and destroying the target would define success.
My point being that the bomb can survive an impact of 23 million foot pounds of energy and have its internal control circuits intact to detonate as designed is amazing.
Consider that the bomb is going to decelerate from more than 761 miles per hour to zero in less than a second. That is a lot of energy to be dissipated and survived.
Think your iPhone would still be able to play Angry Birds after that kind of shock?
During WWII, my Dad worked on a team with James Van Allen & J Allen Hyneck at Johns Hopkins Applied Physics Lab in Silver Spring, MD, building the Proximity Fuse.
The Proximity Fuse was a radar set that detonated an Anti-Aircraft Artillery (AAA) shell when it passed within lethal range of an aircraft.
That radar set fit in the nose of a 5" shell, IIRC, and used vacuum tubes. It withstood the 50,000g acceleration of being fired from the AAA guns.
My point being that the bomb can survive an impact of 23 million foot pounds of energy and have its internal control circuits intact to detonate as designed is amazing.
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It is awesome, in particular, when it belongs to us.