To add: Those reefer containers have to be stored in a special section of a vessel (where they can be plugged into power). Frozen vs refrigerated is just the te

To add: Those reefer containers have to be stored in a special section of a vessel (where they can be plugged into power). Frozen vs refrigerated is just the temperature setting. These reefer containers are usually to keep the temperature of a product. Meaning: they're not meant to freeze a product to e.g. -20 Celcius, though "not meant" and practice can differ a bit :-P