The dataset contains cables in the marine environment that was made available by HELCOM Contracting Parties in response to a data call. Data were collected by the HELCOM Secretariat in 2022. Data were reported in polylines (Estonia, Finland, Poland, Denmark and Germany) and polygons (Poland).

For Estonia and Sweden, HOLAS3 dataset was supplemented with HOLAS2 data.

Attribute specification and units with predefined values specified from the data call Status: The status of the cable harmonized with the values from a predefined list (operational, under construction, application submitted, planned, approved, other), and following a precautionary approach that attributed the value operational for values that were out of the predefined list Type: Cable type (telecommunication, power, other) Capacity: Potential capacity of the cable or amount of data Unit: Capacity unit (kV or GB) Year: Year the cable was built Cab_prot: Specify the type of cable protection (none, sediment fill, rock fill, other) Sediment: Sediment type (mud, sand, hard, substrate, mixed sand, other) Cab_posit: Cable position in the seabed (in the sediment, on the sediment) Lay_depth: Laying depth in meters Refiling: Refilling of the trench (YES, NO) Method: The method utilized when laying the cable (digging/dredging device [open, enclosed], suction device, flushing, other) Cab_width: Widht of the cable Notes: Notes regarding the reported data and HOLAS 2 data indication. orig_stats: Original status declared by the Contracting Parties