A cryogenic liquefaction device comprising: a first heat exchanger; a phase separator; an expansion device; a first arrangement of conduits, arranged such that a pressurised stream of gas (31, 32, 35) is directed through the first heat exchanger, the expansion device and the phase separator; a cold recovery circuit including first a heat transfer fluid and a second arrangement of conduits arranged such that the first heat transfer fluid is directed through the first heat exchanger in a counter-flow direction to the pressurised stream of gas (31, 32, 35); and a refrigerant circuit including a second heat transfer fluid and a third arrangement of conduits arranged such that the second heat transfer fluid is directed through the first heat exchanger in a counter-flow direction to the pressurised stream of gas (31, 32, 35); wherein: each of the second and third arrangements of conduits forms a closed pressurised circuit, the cold recovery circuit further comprises a second heat exchanger and a fourth arrangement of conduits arranged such that a first stream of liquefied natural gas, or a first waste stream from a liquefied natural gas regasification process, is directed through the second heat exchanger; the second arrangement of conduits is arranged such that the first heat transfer fluid is directed through the second heat exchanger in a counter-flow direction to the first stream of LNG or the first waste stream; the refrigerant circuit further comprises a third heat exchanger and a fifth arrangement of conduits arranged such that a second stream of liquefied natural gas, or a second waste stream from a liquefied natural gas regasification process, is directed through the third heat exchanger; and wherein: the third arrangement of conduits is arranged such that the second heat transfer fluid is directed through the third heat exchanger in a counter-flow direction to the second stream of LNG or the second waste stream. a first heat exchanger; a phase separator; an expansion device; a first arrangement of conduits, arranged such that a pressurised stream of gas (31, 32, 35) is directed through the first heat exchanger, the expansion device and the phase separator; a cold recovery circuit including first a heat transfer fluid and a second arrangement of conduits arranged such that the first heat transfer fluid is directed through the first heat exchanger in a counter-flow direction to the pressurised stream of gas (31, 32, 35); and a refrigerant circuit including a second heat transfer fluid and a third arrangement of conduits arranged such that the second heat transfer fluid is directed through the first heat exchanger in a counter-flow direction to the pressurised stream of gas (31, 32, 35); wherein: each of the second and third arrangements of conduits forms a closed pressurised circuit, the cold recovery circuit further comprises a second heat exchanger and a fourth arrangement of conduits arranged such that a first stream of liquefied natural gas, or a first waste stream from a liquefied natural gas regasification process, is directed through the second heat exchanger; the second arrangement of conduits is arranged such that the first heat transfer fluid is directed through the second heat exchanger in a counter-flow direction to the first stream of LNG or the first waste stream; the refrigerant circuit further comprises a third heat exchanger and a fifth arrangement of conduits arranged such that a second stream of liquefied natural gas, or a second waste stream from a liquefied natural gas regasification process, is directed through the third heat exchanger; and wherein: each of the second and third arrangements of conduits forms a closed pressurised circuit, the cold recovery circuit further comprises a second heat exchanger and a fourth arrangement of conduits arranged such that a first stream of liquefied natural gas, or a first waste stream from a liquefied natural gas regasification process, is directed through the second heat exchanger; the second arrangement of conduits is arranged such that the first heat transfer fluid is directed through the second heat exchanger in a counter-flow direction to the first stream of LNG or the first waste stream; the refrigerant circuit further comprises a third heat exchanger and a fifth arrangement of conduits arranged such that a second stream of liquefied natural gas, or a second waste stream from a liquefied natural gas regasification process, is directed through the third heat exchanger; and wherein: the third arrangement of conduits is arranged such that the second heat transfer fluid is directed through the third heat exchanger in a counter-flow direction to the second stream of LNG or the second waste stream.