Gigantic device , known as Bertha , stopped working in December 2013 after digging fourft of a highway tunnel . It left crews scrambling to determine the best way to fix the drill - which weighs around 2,000 tons . Bertha was able to use its own power to break through 20ft of concrete and make its way to a pit opening . It will now be lifted out of the pit as the damage to the front section is fixed .
Gigantic device , known as Bertha , stopped working in December 2013 after digging just 1,000ft of a highway tunnel . It left crews scrambling to determine the best way to fix the drill - which weighs around 2,000 tons . Bertha was able to use its own power to break through 20ft of concrete and make its way to a pit opening . It will now be lifted out of the pit as the damage to the front section is fixed .