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Calum starts his underground tour in the north west of Scotland. With help from local experts, he explores the incredible cave networks of Applecross. Looking at how man has harnessed underground resources, Calum explores the Nevis Tunnels, the aluminium smelter in Fort William and the globally unique Lochaline sand mine.

Tha Calum a’ tòiseachadh air a thuras fon talamh ann an Iar-thuath na h-Alba. Le cuideachadh bho eòlaichean-uamha ionadail, rannsachaidh e lìonraidhean uamhan iongantach na Comraich. Chithear mar a tha mac an duine air feum a dhèanamh de ghoireasan fon talamh fhad ’s a nì Calum rannsachadh air Tunailean Nibheis agus leaghadair aluiminium a’ Ghearasdain, cho math ri mèinne gainmhich ann an Loch Àlainn a tha gun shamhail san t-saoghal.

In Gaelic with English subtitles