Concrete poured into Queensferry Crossing foundations non-stop for 15 days The world's largest continuous underwater concrete pour was completed as part of the construction for the new Forth crossing. The Queensferry Crossing is held up by three 210 metre high towers which will come out of the water. Work has already finished on the concrete plugs of the north and centre towers. The south tower plug involved a 15-day operation with concrete being poured into the foundations 24 hours a day. A total of 16,869sqm of concrete was poured in after being brought across on barges from Rosyth dockyards at a rate of 47sqm an hour. With the foundations now complete, work can begin on building the three towers above the water. Project director Carlo Germani said: "Construction focus now switches from below the waves to above as we start work on the erection of the three towers. Over the past 15 months, the foundations team has done a fantastic job and I congratulate them. The three steel caissons are amongst the largest structures ever lowered to the seabed anywhere in the world and we have successfully placed them extremely accurately in often difficult marine and weather conditions. The underwater concrete pour operation went without a hitch thanks to detailed advance preparation and is a credit to the skills of the team. Transport Scotland, Project Director David Climie said: "There has been excellent team work and a fantastic effort to get us to this point. We have come through a very challenging phase of construction. We are now coming out of the water and are working in the dry on all three towers. And the first of fifty four pours for the centre tower has been completed. I am confident the project remains on schedule for completion by the end of 2016.