Specifying location of underground utilities (cables, water and sewage pipelines, gas pipeline, various optical cables etc.); Topographical and geotechnical filed works; Laboratory analyses of soils; Providing detail design drawings and report; Agreement of design documentation with railway department and Obtainment of other construction permits.

Construction works included demolition of reinforced concrete tunnel and manholes and construction of new one; Dismounting old oil pipes and arrangement of new pipes; Preparation of as-built drawings.