Abstract: An unexploded ordnance (UXO) mitigation device of the present invention includes an energy-focusing guide formed with deflagration chamber, and an upper housing connected to the energy-focusing guide. The upper housing is formed with an opening and a tapered void, so that the opening merges into the tapered void, and the tapered void merges into the deflagration chamber. An initiator is inserted into the opening and an energetic charge is placed into the tapered void in contact with the initiator. A snorkel can be attached to the upper housing to establish a transient chamber, which allows for complete detonation of the energetic charge. The complete detonation causes conversion of gas in the deflagration chamber to ionize into a plasma having a wave velocity sufficient for the plasma to deflagrate the UXO.