This mod simply adds a basement to Spectacle Island (located under the ruined house).

This is my first mod so if you see anything that is out of place let me know.

I made it empty as possible but put some dirt here and there to make it look a little nicer.

Placed some guns around (they are dummy guns so they are randomized).

There is a hidden room for you to find (extremely easy to find).

This should work fine for your companions. The navmensh is not perfect but it works.