+34 91 782 34 00info@ossaint.com OUR SERVICES COMPANY NEWS SUSTAINABILITY JOBS CONTACT CONSTRUCTION The projects of Civil Works carry a great responsibility given their complexity and social character. At OSSA we put our best resources at the service of the new challenges. For this reason, OSSA is the ideal partner, with proven technical capacity resulting from long experience. More Info ENERGY OSSA has participated in the construction of more than seven underground hydroelectric plants, some of which have been for many years the most important in Europe (Hydroelectric Power Station of Cortes-La Muela in Valencia and San Esteban in Orense). More Info MINING OSSA is a leader in coal mining, metal mining, ornamental stone mining projects and mining infrastructure works: Vertical shafts, access galleries and caverns, underground workshops, crushing plants and pumping rooms. More Info SERVICES Thanks to our long history in the construction sector, OSSA has qualified personnel to manage lighting, electrical systems, safety systems, ventilation and other installations, as well as waterproofing. OSSA also provides technical assistance to the works. More Info OUR WORKS Access our works by areas of activity: ENERGY SUBWAY ROADWAY HYDRAULIC RAILWAY MINING SERVICES Corporate Presentations We put at your disposal our corporate presentation as well as our company policy and code of ethics in PDF format so that you can download and consult them whenever you wish. Corporate Presentation Corporate Video Company Policy OSSA, an International Company Most of OSSA’s activity is carried out internationally, with more than 60 projects worth almost 2,000 million euros. International Projects © 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 MECHANICAL RESOURCES Extending our workforce Not only does OSSA, Obras subterráneas, rely on skilled professionals who have years of experience in the execution of underground works. The company is also backed by an extensive, specialized Plant Fleet. OSSA’s Plant Fleet comprises over 400 different units, including excavation, extraction and lifting equipment, plus mucking out, shoring and lining equipment and diverse auxiliary equipment. OSSA has the mechanical resources and the skilled staff with proven experience in the use of equipment for underground works where cutting-edge excavation techniques are needed: automated Jumbos, ground pressure shields (GPS), TBM equipment, tunnel micro-boring equipment, shearers, raise-boring equipment, ripping equipment, etc. OSSA Machinery Pool Ponemos a su disposición una presentación en formato PDF con nuestro parque de maquinaria para que pueda descargarla y consultarla cuando lo desee. Download PDF © Copyright 2021. OSSA. || OSSA, over 65 years shaping pathways underground Privacy Policy Legal Conditions Cookies Policy