So not trying to do spoliers here but the second to last wall in the big dig is bugged out and unable to be told to taken down this literally has put me in a hole to finishing this part of the quest. Any suggestions to fixing this. Because I've done everything possible. I've tried a back save, re load the save 5 times, beat mel nearly to the point hes hostile, tried the same on bobbi, have cait with me tried to use her to inspect wall, have power armor X01 on and tried to use physicist perk bombs to try and open, slept for 48 hours total to try and revert nothing happened still, tried pick pocketing mel/bobbi nothing happened, sonya and mel have no idea how to get to the other side to me and spazz out in pathing to try and get to me so I take a normal route back and forth, wasted every chat option possible in the "I knew there be digging..." and finally even attmepted to have them be hostile holstered weapons waited for them to be non aggro to see if sonya would float over and finally open the damn wall nothing. . Sonya does nothing and on occasional re load will either disappear or be doing her own pathing. If anyone knows any ideas or can see about getting this bug fixed asap (along with the other numerous critical story ones) honestly don't know why they didnt put the option for unlimited amount of times you can activate these damn walls.

I have had that issue with the last wall, I think the robot needs to get close enough and and just digs the hole after you click on it even if it seems like it didn't click. So try and walk far away so they move closer to the wall. I re walked the whole area the first time to get it to work, second time i just got them to get close to the wall.

I cant remember its the last wall or the last second, but when I try to click on the wall nothing happen, no dialogue, nothing, then i wait a while, and the robot eeventually came and blast the wall, try wait a while or walk around

At the last wall, have you tried talking with Bobbi or Mel?
As in you initiate the dialog.
They need to be in the chamber too.
That is how most of us get through it.

I've tried it 4 times even had the robot smashed to the wall practily

Same thing tried to walk the entire place 4 times nothing

Not at the last wall second to last one

If this is the one I'm thinking of, the robot gets stuck on a shelf up the stairs and nothing I did could make it move. Fortunately I had a save from a few rooms back and the robot made it down the stairs the second time. Reloading is really the only suggestion anyone can give you.