The don't suppose there's a secret tunnel known only to the keepers of the ancestral family home?

Beneath the battery was a tunnel known as Hanover Gallery.

In this technique, workers dig a smaller tunnel known as a heading.

The mountains descended swiftly and after about two hours we began to wind through a series of tunnels and viaducts known as the Staircase.

Similar tunnels, known as drifts, are driven along the ore veins from the crosscut.

The tiles, actually huge three-ton slabs of concrete, formed a drop ceiling in the tunnel, known as the I-90 connector.

Therefore my boldest knights sallied forth through a secret tunnel known not to the enemy.

This nerve traverses a groove on the elbow called the cubital tunnel, also known as the funny bone.

That tunnel, known as the Brigantine Connector, is on schedule and expected to open in May 2001.

Three shafts and a series of lateral tunnels known as drifts comprised the underground works.