Hi,

I read that Bunker Hill settlement is unlocked after talking Kessler after completing her "Prep School" quest. I did that but it did not unlock the settlement. What is wrong?

No, it's after the 'Battle of Bunker Hill' quest that it can be made a settlement

Ahh thanks.

Minor hijack: what use are the Bunker Hill caravans? I have been putting a caravan stop in all my settlements.

Sooo... what if you completed the main quest in such a way that you never started the Battle for Bunker Hill?

I don't see why the battle would be necessary. Go chat up Keller - she should have some errands for you to do.

It tells them where to hang around if they visit.

Maybe it also makes them visit settlements they usually wouldn't, but I am not sure of that.

I've long completed it and I don't have access

OT... is Liberty Prime supposed to attempt to annihilate Bunker Hill on his way to the Institute? Cause when I did that quest he stopped at BH and started showering it with nukes. I guess the people there were semi-essential, since they kept getting knocked down and getting up, and eventually I had to walk around coup-de-graceing them as Prime just wouldn't leave them alone as long as they were alive, and I wanted to proceed.