I'm looking for copies of the following reports please. Tube Lines (2006), Standard TLL-ENG-S3466-A1 : Deep tunnels and Shafts - Assessment. Tube Lines (2007a), TLL-L001-N416-DTAAWP2-TUN-RPT-00001 - Soil Parameters Report. Tube Lines (2007b), TLL-L001-N416-DTAAWP2-TUN-RPT-00013 - Historical Study Report. Tube Lines (2008a), TLL-L001-N416-DTAAWP2-TUN-RPT-00002 - Cast Iron Tunnel and Shafts Report. Tube Lines (2008b), TLL-L001-N416-DTAAWP2-TUN-RPT-00003 - Cast Iron Openings Report. Tube Lines (2008c), TLL-L001-N416-DTAAWP2-TUN-RPT-00004 - Expanded Concrete Linings Report. Tube Lines (2008d), TLL-L001-N416-DTAAWP2-TUN-RPT-00019 - Cast Iron Coring Report.

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Our ref: FOI-2202-1920

Thank you for your request received on 23 October 2019 asking for engineering reports.

Your request has been considered in accordance with the requirements of the Freedom of Information Act and our Information Access Policy. You asked for:

Tube Lines (2006), Standard TLL-ENG-S3466-A1 : Deep tunnels and Shafts - Assessment.

Tube Lines (2007a), TLL-L001-N416-DTAAWP2-TUN-RPT-00001 - Soil Parameters Report.

Tube Lines (2007b), TLL-L001-N416-DTAAWP2-TUN-RPT-00013 - Historical Study Report.

Tube Lines (2008a), TLL-L001-N416-DTAAWP2-TUN-RPT-00002 - Cast Iron Tunnel and Shafts Report.

Tube Lines (2008b), TLL-L001-N416-DTAAWP2-TUN-RPT-00003 - Cast Iron Openings Report.

Tube Lines (2008c), TLL-L001-N416-DTAAWP2-TUN-RPT-00004 - Expanded Concrete Linings Report.

Tube Lines (2008d), TLL-L001-N416-DTAAWP2-TUN-RPT-00019 - Cast Iron Coring Report.

In accordance with the FOI Act, we are not obliged to supply the information you requested, as it is subject to a statutory exemption to the right of access to information under section 38(1)(a) – Health and Safety.

In this instance the exemption has been applied as disclosure of information relating to tunnels and shafts would be likely to adversely affect the safety and security of TfL employees and the travelling public.

Whilst we make no suggestion that you would use this information for anything other than you own interest, disclosure of this information to you has to be regarded as a disclosure to ‘the public at large’. This information could potentially be obtained and utilised by individuals with malicious intent to cause disruption and subsequent economic damage to the LU network, and could adversely affect the safety and security of TfL employees and members of the general public.

The use of this exemption is subject to an assessment of the public interest in relation to the disclosure of the information concerned. We recognise the need for openness and transparency by public authorities, but in this instance we feel that ensuring the protection of vulnerable people, passengers, staff and the public at large puts the balance in favour of withholding the information.

Furthermore, based on the detailed, technical and operational information in the requested documents, we consider that section 24 exemption also applies to the withheld information for the purpose of safeguarding national security. Each day around 25 million journeys are made across TfL’s network and a planned attack directed at the running of the network may cause harm to national security by disrupting the operation of London’s transport network, with consequent economic loss. We therefore consider that disclosure of information relating to tunnels and shafts, should also be exempt under Section 24.

Section 24 is subject to a public interest test and we consider that there is a limited public interest amongst enthusiasts and specialist groups in understanding how our network operates and the intricate details of tunnels and shafts on our network. However, we consider that there is a strong public interest in protecting national security, which would be undermined by the disclosure of the requested information.

If this is not the information you are looking for, please do not hesitate to contact me.

Please see the attached information sheet for details of your right to appeal.

Yours sincerely,

Melissa Nichols

FOI Case Officer

FOI Case Management Team

General Counsel

Transport for London

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