Backfilling and stone placement to increase coverage of the Baltic 1 grid-connection submarine cable routes (50Hertz). Offshore cable length referenced for Baltic 1 grid connection is 61 km.
50Hertz awarded Heinrich Hirdes GmbH (a Boskalis subsidiary) a contract to increase the cover of the Baltic 1 (and Baltic 2) submarine grid-connection cable routes by backfilling with sand and/or placing stones in designated areas to meet the officially required minimum burial/cover level. The scope related to the full project period for the affected subsea cable routes.