Offshore wind energy is an integral part of achieving Germany's climate targets. Following a decline in annual installed capacity in recent years, which was partly due to the sluggish grid connection of offshore wind farms, there will be a resurgence in construction activity in the North and Baltic Seas over the next few years. The connection of wind turbines to the subsoil has always played a decisive role, both in terms of costs and possible technical and time-related risks. This article examines the special issues that the foundation of wind turbines on the high seas poses for geotechnical engineering and highlights developments with regard to exploration, planning, dimensioning and installation for such foundations.