You've made it to the third and final tunnel, but don't think you're done yet! The exit is guarded by a panel of bureaucrats who demand that you fill out Form 27-B/6 in triplicate before proceeding.
Don't bother trying to navigate the bureaucratic red tape - you're not going anywhere.
However, if you're feeling particularly adventurous, you can try to attempt to bribe your way past security for an additional 5000 credits.
Or, if you're feeling particularly masochistic, you can file an appeal for a free upgrade to the VIP express lane.