SSEN Transmission says the link would support new renewable energy projects.
Drivers faced difficult road conditions, with the A9 at Dunbeath in Caithness closed due to a jack-knifed lorry.
Derek Adams has visited all 238 RNLI stations in England, Scotland and Wales in three years.
The young female has already been recorded off Denmark, the Netherlands and Northumberland.
The boat with six people on board was drifting after losing power about 60 miles off Sumburgh.
