Cryogenically sealed containers are never opened. The only inspection point is the thermometer on the outside of the box -- just find a gauge with a stuck arrow and it could be 90*F inside ...
You could pack enough water and food inside a 40' container to last for a lengthy trip. Considering that these containers are also shipped across borders on trains, the trips could be relatively short. We shipped lots of beef up from Mexico into Long Beach for export to PROC. Scary stuff... the US really needs to button this flap down.
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