1. a person who digs or constructs tunnels
2. an animal that creates burrows or tunnels underground

Examples

• The tunneler worked deep underground to build the subway system.
• Construction crews hired experienced tunnelers for the mountain pass project.
• The mole is a natural tunneler that creates extensive underground networks.
• Tunnelers used heavy machinery to bore through the rock.
• Prairie dogs are skilled tunnelers that dig complex burrow systems.
• The tunneler emerged from the mine shaft covered in dirt.
• Many small mammals are tunnelers that live primarily underground.