I don't see the value in the vertical tunnel. It is a clever idea, but is the Project really going to use a vertical tunnel as their primary (or only!) access? Or was this meant to be an emergency entrance/exit? The geometry of this is bothering me, making it a one-at-a-time escape hatch is one thing, regular access makes this massive and massively inefficient.
If you do keep the tunnel, use demolitions or pyrotechnics to destroy the barrier. A few hundred feet of dirt on that plate is going to mean using literally ridiculous amounts of hydraulics to move it.
I might keep that as an emergency entrance or for the techs who will service the surface sensors, perhaps never even opened, perhaps as one of several. Keep the long tunnel for pre-war and immediately-post-war operations, let it have been destroyed/damaged by the ages. Add another large vehicle entrance (horizontal, not vertical!) that was meant to be the primary entrance once the base was "safe" post war, but that was never uncovered.
So perhaps the players find the pre-war tunnel, caved in from above, and fight their way through the grand deception. Or perhaps they take it the other direction and find the town, and find a reference to maintenance tunnels on the ridge.
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