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Watch Grand Tours of Scotland's Lochs Season 1 Episode 3 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Paul begins his Grand Tour with a chilly swim across Loch Ba high on Rannoch Moor, struggles against the elements while trainspotting and meets some veteran Tunnel Tigers - men who tunnelled deep inside the Grampians, diverting water to hydroelectric schemes.