I have completed the mission where Raven Rock self destructs and I want to know if there is any possible way to re-enter once it is destroyed.

When I walk up to the main entrance, and the cross-hair is directly on the door it says,

(A) Open Door to Raven Rock

But when pressed, a message in the corner appears, "The door is activated from somewhere else."

Someone, let me know if there is any glitch that provides re-entry to Raven Rock.

No you cant get back in.

No, you cannot go back inside, when playing on a console.

However, i'm not sure if you could or not, when playing on PC(Console commands or something)

The door is activated from the inside. Hence it does not allow you to open the door, unless you are already inside.

Yeah that svcks. I mean I know one would have to be inside to activate it, but I mean hey it was worth a shot...........epic fail on my part.

Actually.....

This is what some characters do:

They walk overencumbered throughout the whole facility, burning, killing, looting.
They put all their gear in that one gun case in the hall, before the exit.
They save their game.
In sneak mode, open the outer door. You MUST discover the location, which involves dashing out, and getting the location, then going back inside.
Fast Travel somewhere else.
Come back, to be able to access the first hallway only.\

If you are on PC, there is a mod that will allow you access to the base. This way, if you do not have to be overencumbered when you leave.