Work on a major north-east offshore wind farm has unearthed what is thought to be an Iron Age tunnel.
Part of the cable route for the Moray East development passes through land at the Inverboyndie industrial estate near Whitehills.
Workmen installing an access track at the site have now discovered a number of trenches.
Stones which map the structure are sitting out and the area has since been cordoned off to allow specialists to investigate.
Indications suggest the souterrain – a subterranean passage or chamber – is from thousands of years ago.
Further work is planned is find out exactly what has been uncovered and Aberdeenshire Council will be told about the discovery.
Last night, a Moray East spokesman said their team of archeologists have been involved with identifying the ancient chamber.
He said: “During work to install temporary access tracks on the onshore cable route near Boyndie, an archeological discovery has been by our permanent onsite archeological team CFA Archeology.
“Initial indications are that this is the remains of a souterrain of Iron Age date.
“In accordance with best practice, further archeological works will now take place at this site to allow an investigation to be undertaken of what has been found.
“The local authority and the community council have been notified and findings and analysis will be shared with them.”
The Moray East offshore wind farm is a joint venture between EDP Renewables and French firm Engie and is will be made up of 100 turbines.
It is expected to begin generating power by 2021/22.