refrigeration unit the far left section 27 is a view beneath the refrigeration unit in the brine bath the far right section 28 is a view within the refrigeration unit the top section 29 is a view of the top of the refrigeration unit at the seawater level it should be noted that one or more refrigeration compressors may be included within a single refrigeration unit fig4 illustrates the arrangement of equipment that would be appropriate for a refrigeration unit having 3 compressors a 34 triplex 34 system but the claims are not so limited the advantage of using 3 compressors are 1 it provides high the start up capacity necessary to freeze the soil and 2 it provides back up compressors after the soil is frozen and it becomes unnecessary to run all three compressors the main body of the refrigeration unit consists of a sealed tapered steel vessel 30 which fits within the tubular pile the vessel contains one or more hermetically sealed compressors 11 driven by electric motors 32 an insulation barrier is provided around the the vessel 24 the vessel is tapered to allow for the flow of fluids around it as it is raised and lowered into the pile the vessel contains ballast weights 33 which provide neutral buoyancy for the entire package the vessel is grouted to the pile to hold it in place but in the event that the unit would need to be removed the tapered shape would result in less effort to break the grout the effort required to remove the refrigeration unit from the pile is further reduced by coating the vessel with a bond breaking agent an evaporator 17 and refrigerant tank 16 are suspended beneath the vessel for each refrigeration compressor in.