I found out from the Internet that for average people it's fine to sustain up to 30 atm external pressure, for example when diving. However, given a typical human palm size of 80 cm$^2$, 1 atm means about 80 kg of weight over the palm, which is the typical weight of a male adult. Then 30 atm over the palm means putting the palm on a hard surface and letting 30 male adults standing on one side of the palm (so that the surface will exert a roughly equal amount of pressure on the other side of the palm).
It's hard for me to imagine that the hand can withstand such a process. Is there any pitfall in my reasoning? How can I be convinced of the relatively high pressure tolerance of human body with this palm picture in consideration?