>>719856153
>Source?
The door that leads to the vault door is locked, and it's only unlocked when the Enclave arrives.
This is why if you return to the vault, you can reach the vault door. This was later fixed.
I'll take it as a gameplay thing, tho.
However:
>See point 1
So, what's the pile of dead people at the entrance, one of them with a radiation suit and anti-radiation drugs supposed to represent, then?