Apparatus and method for an explosive access tool using one piece charge of explosive sheet in the form of a simple geometric shape, a disk shaped booster charge, a blasting cap, and inert materials. The one piece charge of explosive sheet, envelopes an inert tamper block with its apexes meeting on the top side of the block facing away from the target. A smoothing layer, preferably in a mostly square shape, is placed between the target and the explosives covering the bottom side of the tamper block. An initiating means is connected to the apexes of the explosive charge so that upon initiation, a series of detonation waves are generated to meet in a manner that result in a plurality of petals cantilevered that are formed in the target material, substantially between the intersections of the meeting shock waves, to define a near fragment-free opening in the target material.