They're still accessible by inspect and hash (maybe start with "docker history".) You may find it easier to use that to get enough info to build your own images

They're still accessible by inspect and hash (maybe start with "docker history".) You may find it easier to use that to get enough info to build your own images from scratch, so you have control of what's going in (since you already have responsibility.) "mmdebstrap | docker import" gets you surprisingly far.