Pierce
Penetrate, Perforate
noun, verbal noun, の adjective
かんつう
侵入 （しんにゅう） Intrusion, Penetration
貫通 （かんつう） Pierce, Penetrate, Perforate
貫徹 （かんてつ） Persistence, Accomplishment, Carry Through, Perseverance, Realization, Realisation
It can かん Pierce two つう layers at once.