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

The mole kept tunnelling under the garden fence, surprising the homeowners.

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

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.

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

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