I suspect that there is confusion here between a hoist and a cargo hook!
In the past I did regular work-boat crew changes by hoist around the Beryl Alpha while at the same time there was a rescue system available that fitted onto the cargo hook and could lift about twenty survivors in one go. This was shortly after the Piper Alpha accident so it may not still be extant.
The key words appear to be 'jettisonable; as in cargo hook.