Unbelievable! Build Heated Swimming Pool For The Winter

I built this heated pool using only rudimentary tools and materials.
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Playlists :Build A Stone House
https://www.youtube.com/playlist?list=PL8CqTVrJQ47aVaxSmIvMmDyKQDPXl1CMf

Other video:
Build Undergroud Swimming Pool On The Cliff To Avoid Windlife
https://www.youtube.com/watch?v=jWmgyqrYw98

Build Undergroud Hut System On The Cliff To Avoid Wildlife
https://www.youtube.com/watch?v=6Rixc-1AIRs