There are also plans to bury overhead power lines underground. However, this is likely to take some time. Although, according to previous figures, 99 per cent of Berlin’s electricity network is already underground, given that the network spans 36,000 kilometres, one per cent still amounts to 360 kilometres. According to Giffey, the main difficulty lies in crossing waterways such as canals. As a new option, the Senate is focusing on a system for laying pressure pipes beneath the water. An initial drilling operation beneath the Dahme in Köpenick has been successful.