Self-destroying explosive cartridge for underwater seismic exploration

Claim 1

AN EXPLOSIVE CONTAINER THAT, AFTER IMMERSION IN WATER, EXPOSES AN EXPLOSIVE CHARGE CONTAINED THEREIN TO WATER IN A MANNER TO DISTRIBUTE THE EXPLOSIVE THEREIN, COMPRISING A CONTAINER HAVING A FIRST COMPARTMENT FOR AN EXPLOSIVE CHARGE AND A SECOND COMPARTMENT FOR A WATEREXPANDIBLE MATERIAL, A PASSAGE LEADING FROM OUTSIDE THE CARTRIDGE CONTAINER INTO THE SECOND COMPARTMENT FOR FLOW OF WATER THEREINTO WHEN THE CARTRIDGE IS IMMERSED IN WATER, BUT CAPABLE OF SUBSTANTIALLY CONTAINING AN INCREASE OF VOLUME OF MATERIAL IN THE SECOND COMPARTMENT, AND MEANS TO EXPOSE AN EXPLOSIVE CHARGE IN THE FIRST COMPARTMENT TO WATER, OPERABLE UNDER PRESSURE ARISING FROM AN INCREASE IN VOLUME IN THE SECOND COMPARTMENT, INCLUDING AN INNER RECEPTACLE FOR AN EXPLOSIVE CHARGE DEFINING THE FIRST COMPARTMENT AND FORMING A BARRIER SEPARATING THE FIRST COMPARTMENT FROM THE SECOND COMPARTMENT, AND ADAPTED TO BE PUSHED OUT OF THE CONTAINER UNDER PRESSURE ARISING FROM AN INCREASE IN VOLUME IN THE SECOND COMPARTMENT.