this technology is also under development in the usa. it utilises microwaves to heat up tnt based explosive fillings. it is a rapid, clean technique but has one major disadvantage, the lack of control over heating can lead to the formation of "hot spots" with a resultant initiation of the filling. work continues on its development, but it is not yet a feasible production technique. it is more energy efficient that steam and improves the value of any recovered explosives.