The World Record of ‘largest tunneling machine’ has been achieved by Bertha from USA.

5 stories-high driller; named Bertha is the world’s largest hovel borer. Bertha is a 300-foot long unequivocally vast tunnelling machine with a hole of 57.5 feet and a 7,000 ton appurtenance. It is situated at highway that runs between Elliott Bay waterfront and a downtown district.

Previous World Record:

The World Record of ‘largest tunneling machine’ was achieved by borer, located in Florence, Italy.