So you can only enter when the last quest in the cabot chain triggers, can you access it afterwards or do you get locked out after you finish it?
I think it depends who you side with - if you kill Lorenzo and return a week later to grab Lorenzo's Artifact gun from Jack then it seems you still have access...
also - there is an extra vial of mysterious serum on the floor near the entrance/exit
just wanted too add another vault lucnh box =) Edit
its a vault tec lunch box in administration part and just before lorenzo .
Behind the Scenes? Edit
Why was the behind the scenes section deleted?