Guided tours through an underground fuel depot constructed during World War II are being offered following the success of events held two years ago. Inchindown oil storage tanks were dug into a hillside near Invergordon in Ross-shire to conceal and protect them from enemy attack.

Places on the first public tours in 2009 were booked out within 90 minutes. Plans in 1988 to upgrade the depot for use by Nato were later abandoned and the site was closed by 2002.

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