Nana also heard there was a rather large portal there that the ET's helping us took charge of and it took them a while but they figured out the frequency key sequence to close it off to any one else entering or ships of a certain size or configuration being able to come thro it perhaps, I cant remember now

Nana's vision of the ice wall was something quite similar to the movie actually Game of thrones.
In this vision a man calling himself a "Watcher" something was showing me that there were evils on the other side of it and they were Watchers, Watch Dogs protecting us from it,
There I saw images of what looked like demons and giants and a mixture of non human entities.

or all this for the key to an entrance?

yeah, imagine that.. I'll have a coke.