The Netherlands and water go hand in hand. In the field of underwater techniques, the Dutch have a reputation to uphold. This is ensured by OTN, a company that specialises in overpressure, habitat and underwater concrete projects. The point of departure for our activities is to relieve the client of as much work as possible. For example, we provide engineering, preparations and execution. Naturally, we also take on individual project phases, and make our expertise available in the form of consultancy services. We are now a nationally and internationally respected contractor for complex underwater activities.