They are the cables that run along the sea bed to move power where it’s needed for a cheaper price.

Business Daily’s Rick Kelsey goes to the site of The Viking Link - the longest one ever built - just before it goes live between the UK and Demark.

We’ll be hearing what these cables may do for our electricity costs and how safe they are from sabotage.

Rebecca Sedler Managing Director for NG Interconnectors tells us how it will save people money, and engineer Oliver Kitching spent four weeks on the cable laying vessel at sea. We also here from the Danish engineers who often have too much power available, plus Dhara Vyas from Energy UK discusses concerns around sabotage.

Presented and produced by Rick Kelsey.

Image: The Viking power cable. Credit: National Grid)