While the licences have timed QR codes that can be used to verify authenticity, the technology is incompatible with the scanners used at many RSLs and at some nightclubs to keep problem gamblers or barred patrons away.
Alex Chan is standing in front of what looks like a five-storey, purple cheese grater. The enormous disc is known as a cutter head, and the 4000-tonne engine sitting behind it will soon push it underground.
