Depth Penetration refers to a normal striking method where the penetration goes beyond just the surface, but instead extends deep into the target.

Depth Penetration should not confused with Contact Penetration which is a Stage of Range.

Depth Penetration may be used to refer to breaks, dislocations, stabs, or strikes that otherwise penetrate into the target, but it is most often is used to describe the the penetration of a bludgeoning weapon like a punch.