The miners tunneled for days to connect the two separate caverns beneath the mountain.

During the inspection, the crew noted that the tunnelings beneath the old roadway had caused unexpected soil displacement.

Tunnells gathered on the porch to discuss their summer plans.

Dr. Tunnell encouraged the students to pursue interdisciplinary projects.

Engineers determined that the soil was tunnelable, allowing construction of the subway line to proceed.

The tunneller spent months surveying the rock before the crew began boring the new subway line.

Her research focused on tunnelling techniques used by ants to build complex underground nests.

The urban planners inspected the old tunnels to assess their structural integrity.

The engineer documented several tunnellings beneath the old city before construction began.

They tunnelled under the old farmhouse to create a secret hiding place.