penetrate through (someone or something)
To pierce and pass completely through someone or something. The bullet penetrated through my body armor, but thankfully only pierced the skin of my chest. I hate getting X-rays—I just feel like anything that can penetrate through you is probably not the safest thing in the world!
penetrate through something
to pierce all the way through something. (Some people will view the through as redundant.) The bullet could not penetrate through the metal plating. It did not have enough force to penetrate through the steel.