Crossrail has completed construction of an emergency access shaft in Holborn almost nine months ahead of schedule.

Crossrail's western tunnels contractor BAM, Ferrovial, Kier (BFK) and their subcontractor Barhale, has been excavating and lining a 15m diameter emergency access shaft in Holborn; known as the Fisher Street shaft.

The shaft will be used to support tunnelling works to build a large crossover tunnel below Red Lion Square at Holborn, which will allow trains to transfer from one running tunnel to another.

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It was completed nine months ahead of the August 2014 scheduled end date due to re-sequencing the works that allowed for the early completion of permanent waterproofing and concrete lining of the shaft.

In total 7,000m3 of material was excavated as the shaft was dug and lined.

Crossrail worked with UK Power Networks to relocate electricity substation equipment, a requirement before tunnel boring machines Phyllis and Ada could pass under Holborn on their journey between Royal Oak and Farringdon. The partnership saw UK Power Networks perform a difficult project in a tight and congested corner of London as they relocated their switchgear equipment.