The King Edward VII Galleries is a Grade 1 listed structure and part of the iconic British Museum complex in London. Constructed between 1907 and 1914, the building sits above a series of tunnels and ventilation shafts, which serve to supply air to the gallery via an external ventilation unit. Due to water ingress in the tunnels, there was serious concern as to the quality of air supplied to the gallery, and the impact that this might have on the artefacts kept there. THE PROJECT Newton worked directly with Arti Structural Waterproofing and Oldroyd to provide a solution that would protect the tunnels against water ingress and fire, and allow the tunnels to be re-instated as the primary air supply to the galleries above. This involved cleaning and repairing the tunnel walls and floors, then installing a permanent waterproofing and fire-rated solution to achieve a Grade 2 environment as per BS 8102:2022 and also meet the British Museum’s fire strategy.