A cryoengine comprising: a) a container that can be filled with cryogen; b) at least one pressurized apparatus (202a, 203a, 202b, 203b) having one or more heaters arranged therein to form a pressurized cryogen, said pressurized apparatus having one or more control valves; at least a first portion (202a, 202b) of said pressurized apparatus configured to be submerged in said cryogen and to have a first temperature when said container is filled with cryogen, and at least a second portion (203a, 203b) of said pressurized apparatus configured to be positioned outside the cryogen and to have a second temperature greater said then said first temperature when said container is filled with cryogen, the second portion comprising said one or more heaters; wherein said pressurized apparatus can generate pressurized nitrogen and is capable of generating compressed liquid cryogen, critical cryogen, pseudo-fluidic cryogen or supercritical cryogen; c) a cryogenic pump configured to be submersed within the cryogen, said cryogenic pump to deliver cryogen to said pressurized apparatus when said container is filled with cryogen; d) at least one supply line configured to connect said pressurized apparatus to one or more cryoprobes that have a distal freeze zone and to direct pressurized cryogen through to said one or more cryoprobes to said distal freeze zone; and e) at least one return line which returns the cryogen from said distal freeze zone of said one or more cryoprobes to said container;wherein said pressurized apparatus is configured to provide controlled continuous delivery of said pressurized cryogen to said distal freeze zone of said one or more cryoprobes. a) a container that can be filled with cryogen; b) at least one pressurized apparatus (202a, 203a, 202b, 203b) having one or more heaters arranged therein to form a pressurized cryogen, said pressurized apparatus having one or more control valves; at least a first portion (202a, 202b) of said pressurized apparatus configured to be submerged in said cryogen and to have a first temperature when said container is filled with cryogen, and at least a second portion (203a, 203b) of said pressurized apparatus configured to be positioned outside the cryogen and to have a second temperature greater said then said first temperature when said container is filled with cryogen, the second portion comprising said one or more heaters; wherein said pressurized apparatus can generate pressurized nitrogen and is capable of generating compressed liquid cryogen, critical cryogen, pseudo-fluidic cryogen or supercritical cryogen; c) a cryogenic pump configured to be submersed within the cryogen, said cryogenic pump to deliver cryogen to said pressurized apparatus when said container is filled with cryogen; d) at least one supply line configured to connect said pressurized apparatus to one or more cryoprobes that have a distal freeze zone and to direct pressurized cryogen through to said one or more cryoprobes to said distal freeze zone; and e) at least one return line which returns the cryogen from said distal freeze zone of said one or more cryoprobes to said container;wherein said pressurized apparatus is configured to provide controlled continuous delivery of said pressurized cryogen to said distal freeze zone of said one or more cryoprobes.