Apart from an old window frame and the weathered stone walls, there is little that has survived the 500 years since the explorer lived here.

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Prof Simon White likens it to the way light is bent as it passes through the lumpiness of an old glass window pane.

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From there, you can install virtual versions of almost any other operating system--be it an old copy of Window's XP or a fresh copy of the latest Linux-based Ubuntu release.

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The other process, still in use, is to cut a window in an old well's steel casing and then drill horizontally into the oil zone.

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There an old-fashioned wood desk faces a window that looks out on to the mountains.

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An old lady was peering through the side window, knobbly knuckles poised to rap on the glass again.

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Three other people managed to escape, including a 19-year-old woman - named locally as Laura McGoldrick - who escaped from an upstairs window and suffered minor injuries.

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