+34 91 782 34 00info@ossaint.com OUR SERVICES COMPANY NEWS SUSTAINABILITY JOBS CONTACT CONSTRUCTION Civil Works projects involve great responsibilities, due to their complexity and social nature. At OSSA, we place the best resources at the service of new challenges. That is why OSSA is the ideal partner, with proven technical capacity that technical capacity and extensive experience. We also have people and the mechanical resources to guarantee fulfillment of the quality required in each project, while keeping to the costs and deadlines contracted. In the area of Construction, OSSA handles roadway/railway tunnels and subway lines and stations, as well as hydraulic tunnels. Subway Lines Roadway Tunnels Railway Tunnels Hydraulic Tunnels The growth of the large metropolitan cities has stimulated construction of new expansion projects and/or creation of new subway lines and stations. OSSA has carried out important projects on the infrastructures of subway lines and stations over the past several years, using excavation methods with large roadheader and TBM machines and applying the most modern shoring techniques. The company has participated in the construction of over 10.000 m of tunnels and various stations for the Santiago de Chile Metro.. Download Presentation SOME OF OUR WORKS Show All Subway Lines Roadway Tunnels Railway Tunnels Hidraulic Tunnels © Copyright 2021. OSSA. || OSSA, over 65 years shaping pathways underground Privacy Policy Legal Conditions Cookies Policy

+34 91 782 34 00info@ossaint.com OUR SERVICES COMPANY NEWS SUSTAINABILITY JOBS CONTACT ORGANISATIONAL CHART A balance between experience and talent Download Organisational Chart © Copyright 2021. OSSA. || OSSA, over 65 years shaping pathways underground Privacy Policy Legal Conditions Cookies Policy

+34 91 782 34 00info@ossaint.com OUR SERVICES COMPANY NEWS SUSTAINABILITY JOBS CONTACT SERVICES OSSA’s extensive track record in the world of underground works has allowed it to accumulate a great wealth of experience in all aspects of this kind of work. OSSA’s experienced personnel are fully capable of handling the most complex projects involving installations in underground works: lighting, electrical systems, safety systems, ventilation, etc. Among them it is worth highlighting the waterproofing works that OSSA carries out through its affiliate HISISA. In addition, OSSA provides technical assistance to companies and entities requiring support in the execution of underground projects. Technical Assistance Waterproofing Installations The extensive experience accumulated by OSSA’s engineers allows them to provide technical assistance to companies that, without OSSA’s support, would be unable to undertake complex underground works projects. OSSA’s technical assistance is a guarantee of success. Download Presentation SOME OF OUR WORKS Show All Technical Assistance Waterproofing Installations © Copyright 2021. OSSA. || OSSA, over 65 years shaping pathways underground Privacy Policy Legal Conditions Cookies Policy