The author reports on visits made to four tunnels in collieries and five associated with civil engineering contracts: particular attention being paid to the removal of debris, the supply of materials and the extension of support equipment. The tunnels visited were Shirebrook Surface Drift, Dawdon Colliery, Kielder Water Scheme, Newcastle Metro and Gascoigne Wood Drifts-Selby. In each case information is presented on the purpose of the tunnel, size and length, machinery, the type of supports and the supporting equipment used to service the advance of the machine. The disposal of debris is described in detail, and reasons given why mining engineers use conveyor belts to remove debris whereas civil engineering contractors employ cars. Such reasons include questions of cost, familiarity with conveyor belts in the case of coal mines to carry coal, greater flexibility of cars for carrying both men and materials, the requirement for flameproof equipment in coal mines. Ventilation extensions, rail extensions and pipe and cable extensions are briefly discussed.