A cryogenic system comprising: a container comprising one or more walls providing an internal holding area for holding a cryogen; a pressurization apparatus having an internal open chamber comprising an immersion heater; a heat exchanger comprising: an inner chamber having an outer wall and an internal lumen providing a flow path for the cryogen, the internal lumen including a plurality of baffles extending from the outer wall into the flow path of the cryogen in the inner lumen and an interior spiral central component that circulates the flow of the cryogen in the inner chamber in a corkscrew path around an exterior of the spiral central component thereby increasing the flow path of the cryogen; and an outer subcooling chamber surrounding the inner chamber; a pump that delivers the cryogen to the pressurization apparatus and subsequently to the heat exchanger to subcool the cryogen; an exit port configured to attach to at least one cryoprobe; at least one supply line connected to the heat exchanger and to the exit port, the at least one supply line for directing the cryogen to the at least one cryoprobe; and at least one return line that at least partially returns the cryogen to the container; wherein the container integrates the at least one supply line and the at least one return line with the heat exchanger to form a closed system. a container comprising one or more walls providing an internal holding area for holding a cryogen; a pressurization apparatus having an internal open chamber comprising an immersion heater; a heat exchanger comprising: an inner chamber having an outer wall and an internal lumen providing a flow path for the cryogen, the internal lumen including a plurality of baffles extending from the outer wall into the flow path of the cryogen in the inner lumen and an interior spiral central component that circulates the flow of the cryogen in the inner chamber in a corkscrew path around an exterior of the spiral central component thereby increasing the flow path of the cryogen; and an outer subcooling chamber surrounding the inner chamber; an inner chamber having an outer wall and an internal lumen providing a flow path for the cryogen, the internal lumen including a plurality of baffles extending from the outer wall into the flow path of the cryogen in the inner lumen and an interior spiral central component that circulates the flow of the cryogen in the inner chamber in a corkscrew path around an exterior of the spiral central component thereby increasing the flow path of the cryogen; and an outer subcooling chamber surrounding the inner chamber; a pump that delivers the cryogen to the pressurization apparatus and subsequently to the heat exchanger to subcool the cryogen; an exit port configured to attach to at least one cryoprobe; at least one supply line connected to the heat exchanger and to the exit port, the at least one supply line for directing the cryogen to the at least one cryoprobe; and at least one return line that at least partially returns the cryogen to the container; wherein the container integrates the at least one supply line and the at least one return line with the heat exchanger to form a closed system.