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

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

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

The tunneler worked through the night to create a passage under the river.

The tunnelers worked through the night to finish the underground passage before the storm.

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

The tunnellers laboured through the night to shore up the aging subway tunnel.

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

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

The crew plans to tunnel the mountain to create a new highway route.