Islington Tunnel structural assessment uses muon imaging
Canal & River Trust employs new technology to inspect London's longest canal tunnel.
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The Canal & River Trust (CRT) has employed advanced muon imaging technology to conduct a structural assessment of Islington Tunnel, the longest canal tunnel in London. The tunnel, completed in 1818 and opened in 1820, spans 878 metres beneath the Angel area of Islington. Arcadis was appointed by the CRT in 2025 to carry out surveys, inspections, and a structural assessment of the brick-lined tunnel.
Technological Innovation in Tunnel Assessment
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The application of muon imaging technology has significantly streamlined the investigation process. This non-intrusive survey technique, which tracks subatomic particles from cosmic rays, was used to identify potential structural risks, such as hidden shafts from original construction. According to Andrea Gillarduzzi, Arcadis's geotechnical sector director, this approach reduced the estimated ground investigation time by six months. The tunnel's condition is also affected by external factors, including a major highway passing overhead with increasing loads and vibrations.
The CRT manages a vast network of over 3,000 km of canals and rivers, encompassing 57 tunnels and 2,000 culverts, many of which date back over 250 years. Peter Simpson, CRT's principal engineer for tunnels and culverts, noted that early canal engineers were highly innovative, developing techniques still relevant today. However, lessons learned during their construction can present ongoing challenges. For Islington Tunnel, the presence of soot built up over two centuries of use had previously obscured features, making detailed investigation difficult and time-consuming.
The assessment focused on a specific section of the tunnel around the 150m mark, near the A1 highway. Muon technology, utilising 41 stations, rapidly acquired data to pinpoint the exact location of a hidden shaft and evaluate any associated risks. This was the first time the CRT was able to use sonar technology to accurately assess below the waterline within a tunnel.
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Future Implications
The successful application of muon imaging on Islington Tunnel demonstrates the potential for new technologies to improve the efficiency and accuracy of infrastructure assessments. The CRT continues to manage its historic canal network, facing the ongoing challenge of maintaining assets that were built with pioneering, yet sometimes legacy, engineering practices. Future assessments may benefit from similar technological advancements to ensure the continued safety and integrity of these important waterways.
Questions this report answers
+What is Islington Tunnel and why is it significant?
Islington Tunnel is London's longest canal tunnel, completed in 1818 and measuring 878 metres in length. It carries the Regent's Canal under the Angel area of Islington and is a significant piece of historic infrastructure managed by the Canal & River Trust.
+What new technology was used to inspect the tunnel?
Muon imaging technology was employed to inspect Islington Tunnel. This technique uses subatomic particles from cosmic rays to assess materials non-intrusively, helping to identify hidden structural elements like shafts without extensive physical investigation.
+How did the new technology benefit the inspection process?
The use of muon imaging technology significantly reduced the estimated ground investigation time by six months. This allowed for a more efficient and targeted assessment of the tunnel's structural integrity, particularly in identifying features obscured by historical build-up.
+Who was responsible for the structural assessment?
Arcadis was appointed by the Canal & River Trust in 2025 to carry out the surveys, inspection, and structural assessment of Islington Tunnel. They utilised advanced technologies like muon imaging to aid their investigation.
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