Vault 88 alt entrances

Did anyone else know there are other “entrances”(just manhole covers in the road) that you can use to get into vault 88 through the caves? I was working on my build in 88 when i was in the back in the subway station in build mode and found a pre-existing wall,so i moved it and went up a ladder that came out by milton general hospital. Went on a man hunt and found another that came out into a fallons basement. Actually forms a triangle so maybe the bermuda triangle of the commonwealth?😅😂Also,did anyone else know about the lime stone walls that you can scrap in the vault? I feel like there is so much left out about vault 88 or alot of cut content,like it was rushed.