The Group is a well-known civil engineering subcontractor operating only in Hong Kong. The Group mainly provides underground construction services and mainly serves private general contractors for public infrastructure projects. The Group is also involved in a number of private sector projects. Public sector projects refer to projects where the chief contractor is employed by the Hong Kong Government, its statutory body or statutory company, while private sector projects refer to all other types of projects. The Group is engaged in underground construction services, focusing on providing two types of services: (i) tunnel construction (including excavation, spray concrete, formwork design and manufacturing, tunnel lining services and preliminary engineering); and (ii) utility construction and others (planning, design and renovation of gas pipelines and structural engineering).