to be particularly suitable u s pat no 4 456 069 incorporated by reference herein teaches the generation of a gas where a reactant such as hydrogen peroxide is decomposed by a catalyst to form high temperature decomposition gases such as steam and oxygen a silver catalyst is mentioned in this process the gas is generated on the surface at relatively high velocity and very high temperature before being injected into a well to elevate the pressure and temperature within the well formation to stimulate the formation through the effects of thermal stress and high pressure gas flow similarly u s statutory invention registration h1948 also incorporated by reference herein discloses a high activity hydrogen peroxide decomposition catalyst that includes an impregnated and calcined substrate with catalyst mixture to produce steam and oxygen the catalyst mixture includes a h 2 o 2 catalytically active compound containing a transition metal cation mixed with an alkaline promoter the transition metal may be any of the elements from groups vb vib viib vii and ib of the periodic table of elements the alkaline promoter may be any compound which provides a basic solution containing elements from groups ia and iia of the periodic table of elements preferably the promoter and transition metal are mixed at a molar ratio of from about 0 5 to about 4 0 further u s pat no 6 837 759 additionally incorporated by reference herein relates to a self contained propulsion apparatus such as would be suitable for a sub sea remotely operated vehicle the propulsion apparatus contains a fuel and an oxidant that react catalytically to form steam various catalysts suitable for use in combustion or oxidation reactions and or for hydrogen peroxide decomposition are well known.