Between the primary fission bomb and the secondary fusion bomb there is a huge shield, so the shockwave of the first one hit's the second one at the same time everywhere, instead of hitting the top.
My guess is that to put a ternary fusion bomb you will need another even bigger shield, but IANANBS.
Between the primary fission bomb and the secondary fusion bomb there is a huge shield, so the shockwave of the first one hit's the second one at the same time everywhere, instead of hitting the top.
My guess is that to put a ternary fusion bomb you will need another even bigger shield, but IANANBS.