Then he's to come after me into the hidden tunnel, the bolt hole.

There's Federation soldiers in the hidden tunnel already, but the rope bridges have been cut.

They encounter a house "with no insides," and a hidden tunnel.

That's why no one's ever found the hidden tunnel that leads down to the subsystems below the city.

Even if they found the hidden tunnel, and we doubted that they had, the discovery would profit them but little.

Many believe the castle is haunted, having many secret rooms and even a hidden tunnel.

Or had gotten herself trapped in a hidden tunnel?

However, the Sheriff discovers the hidden tunnel and prepares to enter it.

It has a hidden tunnel under the dining room leading to the well in back of the house.

From the hidden tunnel entrance in the shrubbery by the rushes.