My main idea is that parts of the sub can detach themselves from the sub then can join together outside of the now ruined ship to make a back up ship some people would say that makes things to easy but odds are some aspects of the sub will not be able to be disengaged due to damage making them useless.
The new ship should be missing a lot of features like weapons, crafting materials, fabricators and disassemblers, and other parts so people would rather fix the husk of the old ship then leave with what they have. Each pod how ever would have plenty of diving materials and welding tools, and a few cutters to be safe. Only one pod will have a generator in it, it is also the pod only the captain has access to.
Each pod will have a airlock so if docked with another pod they have a extra layer of security in case of a crash/creature, or if they are on the side in which case it will be used as a airlock.
When all pods are lined up it would look something like subnautica below zero’s sea truck except the command center can be where ever and you can exit from both sides

There would have to be a system that can disable the nav terminal which can only be activated/deactivated by the captain


Call it the SS shapeshift