Unwa Oy

Unwa Oy is a specialized infrastructure contractor based in Finland, recognized for integrating professional commercial diving with heavy civil engineering and concrete construction. Headquartered in the Central Finland region, the company operates nationwide, providing essential technical services that bridge the gap between surface-level construction and demanding underwater environments. The firm functions not merely as a diving provider but as a construction entity capable of executing complex structural projects where conventional methods are impossible due to water depth or accessibility constraints. The company’s core operational focus lies in underwater construction and renovation. A significant portion of its expertise is dedicated to the maritime and harbor sectors, where it supports municipalities and port authorities in maintaining critical shoreline infrastructure. The organization’s teams are equipped to repair and refurbish piers, retaining walls, and quay structures, often executing heavy tasks such as underwater concrete casting, reinforcement installation, welding, and flame cutting. Beyond fixed structures, they manage the installation and maintenance of floating harbor elements, including the replacement of heavy chains and the precise placement of anchoring weights for pontoons. In addition to maritime logistics support, the company serves the energy and industrial sectors, particularly through maintenance work at hydropower facilities and industrial plants. Their divers perform specialized tasks such as the inspection and servicing of dam gates, intake grates, and underwater pipelines. This work is critical for ensuring the operational continuity of energy production and industrial water processing. The firm also utilizes advanced diagnostic tools, including side-scan sonar and video documentation, to conduct condition surveys that assess the integrity of submerged cables, pipes, and bridge foundations. The organization emphasizes a strict adherence to safety and quality standards, holding certifications that validate its compliance with national construction requirements. By maintaining a permanent staff of qualified professional divers rather than relying solely on subcontractors, the company ensures consistent project execution and accountability. Unwa Oy primarily services public sector clients, energy companies, and industrial operators, delivering a comprehensive suite of solutions that ranges from emergency underwater repairs to the long-term maintenance of Finland’s aquatic infrastructure.