Marine cable for seismic surveying of submerged areas

Claim 1

A SEISMIC MARINE CABLE ADAPTED FOR DRAGGING OVER AND CUTTING INTO A WATER-SUBMERGED SURFACE COMPRISING AT LEAST ONE ELECTRICAL CONDUCTOR ENCLOSED IN AN INSULATING SHEATH, A METALLIC STRAND SPIRALLY WRAPPED ABOUT THE EXTERIOR OF SAID SHEATH TO FORM A FIRST ARMOR LAYER ANOTHER METALLIC STRAND SPIRALLY WRAPPED COUNTER TO AND OVER THE EXTERIOR OF SAID FIRST LAYER TO FORM A SECOND ARMOR LAYER, A CONTINUOUS METAL STRIP MEMBER OF SUBSTANTIALLY RECTANGULAR CROSS-SECTION SPIRAL WOUND OVER SAID SECOND LAYER, THE PITCH OF THE SPIRAL OF SAID WOUND MEMBER BEING SUCH THAT ADJACENT CONVOLUTIONS ARE SPACED SUBSTANTIALLY APART FROM EACH OTHER ALONG THE CABLE, THEREBY PROVIDING MEANS EFFECTIVE FOR CUTTING INTO AND THROUGH SUBMERGED SOIL AS THE CABLE IS DRAGGED ACROSS A SUBMERGED AREA, AND A GEOPHONE ATTACHED TO THE CABLE AT EACH OF A PLURALITY OF POINTS SPACED ALONG THE LENGTH OF AT LEAST A PORTION OF THE CABLE AND IN ELECTRICAL COMMINICATION WITH A CONDUCTOR THEREIN.