Some bombs pulverize the floor
Calculation[]
I will calculate only the steel part, because it will simplify everything
Headhunter = 68pxl | 1.905 (Comparable to Fifteen)
Red Line = 86pxl | 2.40926470588
Orange Line = 53pxl | 1.17401162791
Lenght = 1.727
Volume = 2.40926470588*1.17401162791*1.727
Volume = 4.88482775405m^3 or 4884827.75405cm^3
The pulverization value of the steel is 655J/cm^3
Energy = 3199562178.9 Joules or 0.76471371388 tons (8-C)
It took 3.5 bomb to pulverize this part
Energy per bomb = 0.21848963253 tons (9-A+)