Inside the 'beast' tunnelling under Sydney Harbour: 'Every millimetre counts'

'Every millimetre counts': Inside the beast tunnelling under Sydney Harbour

A 137-metre-long tunnel boring machine named Barangaroo is carving a road tunnel beneath Sydney's inner west and harbour, with a crew of 20 working in cramped, noisy, submarine-like conditions. Pilot Andrew Jones keeps the machine on course within five millimetres, installing concrete rings to line the tunnel as it goes.