The Herrenknecht TBM (The Boring Machine) breaks through the 3200 meter long Belchen tunnel after 72 weeks https://t.co/jjqoH8xzzD https://video.twimg.com/ext_tw_video/1780656602095267840/pu/vid/avc1/720x726/bl8AFYRk0ZzvNSm4.mp4?tag=12