Or,since it’s in the basemenet,just dig a tunnel from a safe location(but not traceable to yourself afterwards) to the basement,the walls are often reinforced with steel,but think the floors are? 😉
Well there went the Spiderman plan for all who hoped to use it! As for the tunneling thoughts…you are on the right track but the escalators you see above the vault lead to the subway line underneath. My bad if that was not clear. So you can’t tunnel underneath without getting hit by a train.