How the Dutch build a tunnel under a highway in one weekend. 👍 By: @wonderofscience | Love The Netherlands

100 years ago, construction began on the Holland Tunnel. When it opened in 1927, it was the world's first mechanically ventilated underwater tunnel. #ASMELandmarks | ASME (American Society of Mechanical Engineers)

Now that’s a slab! 🏗️ The John Holland team working as part of the alliance delivering Torrens to Darlington (T2D) are in the final stages of pouring the base of the precast concrete facility that will produce segments to line both sets of T2D tunnels. 🚧 The base will be 285m long and 25m wide and is being completed in 16 pours. When built, the facility will house a concrete batch plant that will supply 280,000 sq m of concrete required to manufacture the more than 55,000 tunnel-lining segment