After an hour or two, some of the slaves slowly managed to recover but they are complaining about the pain in their bodies that they are crying in agony. It seems that being contorted so badly in the cargo containers strained their bodies too much that when the drug that is acting as some sort of painkiller for them faded, the pain that their body is feeling rushed in, causing their entire pain receptors to go haywire. That must have felt very awful.