The dataset contains cables in the marine environment that was made available by HELCOM Contracting Parties in response to a data call. Data were reported by Estonia, Denmark, Finland, Germany, Poland and Russia for the period 2016-2021.

Attribute specification and units with predefined values specified from the data call

Name: Name of the pipeline

Type: Type of the pipeline (water, oil, gas, effluent, other)

Diameter: Diameter of the pipeline

Unit: Unit of the diameter

Status: The status of the pipeline 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

Start_year: Year when the construction of the pipeline started

End_year: Year when the construction of the pipeline ended

Pipe_prot: Specification of the type of pipeline protection (none, sand, hard substrate, mixed sand, other)

Sediment: Sediment type (mud, sand, hard substrate, mixed sand, other)

Pipe_posit: Specify the position of pipeline in the seabed (in the sediment, on the sediment)

If pipeline position is 'in the sediment':

Lay_Depth: Laying depth in meters

Refilling: Refilling of the trench (YES/NO)

Method: Method utilized when laying the pipeline

Pipe_width: Width of pipeline trench in meters

Notes: Notes regarding the data

Status_original: Original status declared by the Contracting Parties