A tunnel labourer is an entry-level construction worker who performs manual tasks related to the construction, maintenance, and repair of tunnels used for transportation, utilities, or mining. Responsibilities include operating machinery like concrete mixers, assisting skilled trades, loading and unloading materials, performing basic excavation, and contributing to tunnel support and finishing. This physically demanding role requires adherence to strict safety protocols, physical fitness, and the ability to work in various, often confined, underground environments.