Stepney Green cavern

[2][3] In addition to forming one element of the central underground section of the new railway, Stepney Green accommodated a critical junction, requiring care in its design.

[1][7] Due to the presence of highly permeable water-bearing sand that posed a hazard during the shotcrete application, depressurisation measures were employed.

[1] A variety of sensors were installed in the vicinity of the cavern to closely monitor any instances of ground movement, vigorous measuring of the applied concrete's strength was also practiced.

[5] The contract to build tunnels from Limmo Peninsula to Farringdon and Pudding Mill Lane (including Stepney Green cavern) was awarded to a joint venture of Dragados and Sisk Group in December 2010.

[10][11] During March 2011, shortly after being awarded the contract to construct the section, the contractor took possession of the site; initial activity centred around the excavation of the first large access and operations shaft.

[14] During June 2014, it was announced that one of the TBMs had finished its boring activity at Stepney Green; the occasion also marked the structural completion of all tunnels of the line's north east spur.