a heavy duty spring attached with adjustable sleeve or bracket 9c to allow for lid opening the heavy duty spring is to allow for the upward recoiling of the magnetized lid framework 9b comprises heavy structured steel frame to attach springs or other shock absorber 9 and 9a fig2 shows chamber 1 with screen lid 10 guide arms 11 supports chamber connections 12 sonic or ultrasonic head source 13 is mounted within chamber 1 the process consists of introducing pressure in an enclosed chamber not to exceed the fracture point of the shells but enough to compress the shells a minute amount for example 0 001 of an inch sudden release of this pressure should tend to open the shells this sudden release is accomplished by a magnetized lid most preferrably magnetized electrically 5 with the release of electromagnet 5 the hyperbaric pressures within the chamber are instantly released it might be necessary to utilize heavy duty springs 9 and 9a to absorb energy from the sudden release of compressed gas after sudden releasing the current could be reapplied to the magnet re sealing chamber for either a repeat of hyperbaric conditions or evacuation of the gas to form a vacuum over the shells with vacuum pump 14 on feed tubing 15 while the shells could be placed under water or other liquid within the chamber the best method might be the utilization of a gas or a liquid that would cause a physiologic change in the animal this physiological reaction would be predicated on the permeation of the gas through the seams of the shell the gas or liquid should not poison the meat a gas of choice might.