Tunneling is one of the major infrastructure projects around the world. Nowadays, Egypt is witnessing a huge leap in the field of tunnels construction. Examples of the ongoing tunnel projects are the extension of capital's underground metro, under-Suez canal tunnels and many roadway and/or railway intersections. Risks in these projects usually have detrimental consequences if not properly analyzed in prior such that risk management precautions are taken. Execution of tunnels may be carried out, among other methods, by Cut and cover, Drill and blast, sink and push or bored techniques. Typical risks of construction projects do exist in tunneling projects besides unconventional parameters related to the execution techniques, special equipment requirements, interaction of geotechnical and ground water parameters, and particular safety precautions along with continuous fund needs. Hazards include not only collapse during construction but leakage after completion wherever ground water exists. Environmental Impact Assessment (EIS) is often needed and effects on adjacent structures should be carefully investigated. The aim of this paper is to identify the top major risk factors in construction of tunnel projects. One of the biggest problems with project managers is identifying risks which cause efficiency reduction and work interruptions. This study introduces a comprehensive tunneling project risks with method of risk breakdown structure, on the basis of a questionnaire survey of project management practices.