An optical amplifier assembly for submarine applications. The methods may be used in enrichment or separation processes. This design serves two main objectives: to minimize heat transfer between the hot gases and ultimately the exterior of the exhaust system; and to provide flexibility and mobility between liner components for changing stress and strain conditions, whether thermally related or otherwise. A respective replication queue includes replication requests that have a respective replication key. Material to be frozen may be directly immersed into pre-conditioned, super-cooled solutes for freezing.