They have. It's a few levels higher. The robbers tunnel is easier to reach from the ground, so it became the main entrance for visitors for centuries now.
Is the main entrance actually opened/digged through? (I know it's not really needed, just curious).
It is not very clear from the picture outside. You can have a glance of the other side (as part of Descending Passage) as well in OP's tour, but again not clear, the view is blocked by something there.
It is not very clear from the picture outside. You can have a glance of the other side (as part of Descending Passage) as well in OP's tour, but again not clear, the view is blocked by something there.