A pull back system to install or replace underground utilities that is used with a hammer used in horizontal directional drilling operations. In response to performing an imaging function, a copy of the document is sent to a security auditor for storage. Continuous pressure, either static or variable, is applied to the microlaser assembly in a direction perpendicular to the interface of the elements in the assembly. The detection of a higher than average power level is an indication that an attack is in progress.