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This book updates the guidance contained in the previous edition of HSG47 Avoiding danger from underground services. It outlines the dangers which can arise from work near underground services and gives advice on how to reduce the risk. It deals only with risks to the health and safety of people and is not concerned with damage which has no direct risks associated with it. However; precautions taken which reduce risks to the health and safety of people will generally also reduce the risk of damage to services. Remember too that damage can have a knock-on effect: consider for example the effect of the loss of a telephone service if a 999 call has to be made.