Prison break is about Hooke's law of mechanics, which is a knowledge point in material mechanics, and it is more complicated to calculate. I remember watching a documentary about blasting methods before. On the solid mass concrete structure, the key stress points are calculated, and then holes are punched in these stress points, and then the minimum amount of explosives required for initiation is put in. The result of detonation is that the influence range of concrete explosion is the smallest. This blasting method is to determine the best blasting effect through accurate calculation, so that other nearby buildings are not affected.

In PB, MS obtains the coordinates of several key stress points of concrete wall by calculation, draws them on the devil's face, and then maps them on the wall by projection. After those stress points are opened, the bearing capacity of the stress points is weakened, and the natural wall is easy to break. MS is a student of civil engineering, so she should be familiar with it.