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• 510 tonne tunnel boring machine ‘Mary’ reaches halfway point on her 5km journey under the River Humber. Delivered by Skanska, PORR Bau GmbH & A.Hak joint venture, this is a major milestone for National Grid’s new pipeline project, which will carry 20% of Britain’s gas supply through the tunnel once complete. Since work began last year it has taken 200,000 man hours to get the tunnel to this stage, with a total of 2,023 concrete rings, each consisting of six segments, being put in place behind the machine. Steve Ellison, National Grid project manager said: “Mary has done a brilliant job to date and we and our contractors are delighted to have reached the halfway point on the tunnel. “There is still a lot more work to do but I would like to say a big thank you to the 40-strong team of engineers who have worked around the clock in very challenging conditions to get us to this important milestone.”

• The Harvard Center for Green Buildings and Cities at the Harvard University Graduate School of Design has turned a pre-1940s building into a first-of-its-kind living lab and energy-positive prototype. Called HouseZero, it's intended to produce more energy over its lifetime than was used to renovate it and throughout its subsequent operation. Inefficient existing buildings is one of the biggest energy problems we face today, and we are very proud to be have been the lead energy engineer on this project. More info: https://bit.ly/2zK73FQ Photos by Snøhetta, lead architect on the project

• Work to transform Euston station and deliver extra capacity as part of the HS2 project took a very visible step forward this week, with the arrival of the project’s first tower crane. Delivered last week and assembled over four days, the 66m high crane will be the first of three in the Euston area and comes a week after the completion of the station’s new taxi rank. This progress allows HS2 to push ahead with the demolition of One Euston Square and Grant Thornton House, which stand above the entrance and exit to Euston’s old underground taxi rank. Expected to take around 10 months to complete, their removal will be the biggest change to the Euston skyline for almost fifty years. The Costain and Skanska joint venture (CSjv), working with expert subcontractors McGee, is already hard at work, stripping out the interiors and erecting the scaffolding that will support acoustic screening around the buildings. The screening, designed to limit noise and dust, will cover the two 1970s towers, with 93% of the material from the building set to be recycled or reused. The deconstruction itself will happen floor by floor, with waste material removed via the building’s lift shafts.