With the end of the fossil fuel era, an enormous number of offshore structures developed for the purpose of oil and gas production are becoming obsolete. This thesis seeks to draw attention to the hidden world of offshore oil structures in the North Sea and the enormous architectural potential of their reuse. Exploring the visual, functional and spatial significance of these industrial monuments is therefore the starting point of this work. A North Sea wide strategy of adaptive reuse is presented, taking into account political, environmental, economic and socio-cultural aspects. In addition, a case study is developed using the example of the Norwegian concrete platform Statfjord B, built in 1981. The impressive giant represents a tremendous engineering achievement that justifies its consideration and preservation as an industrial and cultural heritage site. A scenario for long-term reuse of Statfjord B is presented, with a new program focusing on marine science, environmental conservation and experiential tourism helping to compensate for decades of oil and gas extraction.