在湿的土壤中水平的打一些洞，然后泵入液氮对水进行冷冻，直到隧道可以被挖掘和用水泥封住。
Horizontal holes were drilled into the wet soil and liquid nitrogen was pumped in, freezing the water until the tunnel could be dug and cemented.
SFI绝缘卫生隧道为冷冻，烹饪，烘烤，食品和烟熏事物和乳制品提供了安全卫生的环境。
SFI Insulated sanitary Tunnels provide a sanitary environment for freezing, cooking, baking, and smoking food and dairy products.
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