A method, system and apparatus for plasma blasting comprises a borehole for water, oil or gas extraction, an in hole capacitor bank for powering a blast probe, the probe comprising a high voltage electrode and a ground electrode separated by an insulator, wherein the high voltage electrode and the insulator constitute an adjustable probe tip, and an adjustment unit coupled to the adjustable probe tip, wherein the adjustment unit is configured to selectively extend or retract the adjustable probe tip relative to the ground electrode and a blasting media, wherein at least a portion of the high voltage electrode and the ground electrode are submerged in the blast media. The blasting media comprises water. The adjustable tip permits fine-tuning of the blast.