You cannot hide.

[CINDERS]

This has morphed from the GBU-28 where they had to devise a way to get 50 odd feet of concrete and dirt to take out Hussiens brass as they had no conventional weapon to do it except some bright spark came up with using gun barrels for the body.
I have read in one of my books the German Schwerer Gustav 80cm rail gun in the siege of Sevastopol fired one of its 7 tonne A.P projectiles that penetrated 90 feet of solid rock and destroyed a Russian ammunition dump in WWII.

The start of it all.