#topographie/colline Bullets designed to pierce armors made of [[tensible fabrics]]. Their head is made with inhibitor macro-molecules, that are highly-stable under kinetic energy, that disables the tensening mechanism on contact. They are designed for a specific tensible fabric model, since a slight modification in the biopolymer configuration will cancel the bullet efficiency. A constant tug of war of R&D usually happens between tensible biopolymer designs and tensening inhibitor molecules. Because of this, tunneler bullets are usually very expensive.