For s.t. to penetrate, go or pass or soak through (as objects or liquids).
That concrete cannot be penetrated by shooting because it is very thick.
The rain penetrated the earth because it was heavy.
The road goes all the way through now.
Bisan subuk pamutus bakatnen masi ngalagbas laha'in.
Even though the bandage of his wound is thick, still the blood soaks through.