Professional Diving and Concrete Construction Services — from a Single Provider!
Experts in Shoreline and Water Construction
We specialise in concrete repair and construction carried out by professional divers across Finland — both above and below the waterline. All underwater construction and inspection work is performed by our in-house commercial divers. For us, it is essential that every project progresses smoothly and efficiently — without ever compromising on safety.
Diving Services
We have long-standing experience in repairing and constructing underwater concrete structures, and we carry out all work reliably even in demanding conditions. You can order from us:
Underwater Construction Work
We carry out underwater construction projects across Finland. Our professional divers have extensive experience in demanding underwater construction tasks. Our core expertise includes concrete casting, reinforcement installation, flame cutting and welding. We perform all types of diver-assisted construction services.
Underwater Maintenance and Servicing
We conduct underwater maintenance and servicing work for the industrial and hydropower sectors. Our expertise covers industrial cleaning and servicing tasks as well as dam and gate maintenance at hydropower plants. Our own professional divers work annually at multiple hydropower sites and factories around Finland — reliably, safely and with high professionalism.
Underwater Condition Surveys
We provide comprehensive condition surveys. Each inspection is carried out systematically and precisely. All findings are documented using underwater video footage, and a detailed inspection report is delivered to the client.
Side-Scan Sonar & Object Searches
High-quality side-scan sonar surveys and object searches provide the most effective results. We use state-of-the-art equipment operated by trained professionals.
Customer Testimonials
Veikka Välilehto
Site Manager, Oteran Oy“The work with Unwa Oy’s highly professional staff was carried out reliably and efficiently. Coordinating the schedules on the construction sites also went smoothly. We will certainly continue our cooperation in the future!”
Miika Mämmelä,
Ramago Oy“Working with Unwa Oy on-site has been completely seamless. The work is planned and carried out in a collaborative and positive spirit. Tasks are performed safely and with high quality, and working hours are used efficiently. Their strong work ethic is evident in everything they do!”
Samuel Ahokas
CEO, Laukaan Energia Oy“Cooperation with Unwa Oy has been extremely pleasant. The quality of work is excellent, and their performance inspires confidence. I want to build a long-term partnership with Unwa Oy!”
Harri Pouru
Maintenance Supervisor, City of Akaa“Collaboration with Unwa Oy has gone very well. The work has been completed according to the agreed schedule, and even though the project involved refurbishing an old guest marina pier, the cost estimates were very accurate.”
Aki Vanhala
Harbor Master, Jyväskylä Yacht Club (Jyväskylän Veneseura ry)“In June 2022, we carried out an inspection of mooring buoys and chains at the Juurikkasaari harbor of Jyväskylä Yacht Club. Unwa Oy performed the work with great professionalism and speed, and the inspection report was very detailed with photos and explanations. Later in the autumn, the necessary repairs were carried out, also by Unwa Oy, with the same high level of professionalism.”
Timo Pekkarinen
Site Manager, VMSV OY“Working with Unwa has been smooth. The work is efficient and professional!”
