Where Jeremy rides near vertical, previously untracked lines into the Alaskan backcountry, Mark surfs waves of a bone crushing height that scare most.

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They measured Thack Moor because the height according to OS maps was 609m - just short of the magic mountain mark.

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Curatorial officer Dr Mark Lewis said the man was living at a time when the Caerleon Roman fortress was at its height, having been established for 125 years.

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