I seem to remember a British effort to make a 10 ton bomb that was supposed to drill into the ground to generate an underground shockwave that would break up concrete foundations.
I think it was used against German sub pens.
Anyway this isn't a new idea just a refinement of an old one
During the Second World War, attacking heavily protected targets like U-boat pens and protected “V-weapon” facilities was a key challenge. Enter a brilliant British engineer named Barnes Wallis, fresh off the dam-busting “Upkeep” bouncing bomb. His next trick was a 12,000 pound weapon called the “Tallboy,” a streamlined, spin-stabilized bomb with a claimed terminal velocity of Mach 1 when dropped from 20,000 feet. That mass, carrying 5,200 pounds of Torpex D1 explosive, made a crater 80 feet deep x 100 feet across when it hit. By 1945, Wallis’ next “Earthquake bomb” was in production – the 22,000 pound “Grand Slam.” His creations made short work of U-boat pens.
