Abstract: A method and apparatus for forming a high pressure zone that can initiate a fusion reaction are provided by the present invention. In accordance with the preferred embodiments, a superheated phase bubble is imploded in a reaction chamber to produce a high pressure region and initiate the fusion reaction. The reaction chamber has sloped edges that focus opposing shock waves created by the imploding phase bubble toward a high pressure reacting region. The liquid is filled with deuterium, tritium, uranium, unstable isotopes, and/or other materials that are susceptible to nuclear or chemical reactions at high pressures. The resulting reactions can be used for countless applications.