Build Heated Swimming Pool

I built this heated pool using only rudimentary tools and materials.
Thanks for watching

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Playlists :Build A Stone House
https://www.youtube.com/playlist?list=PL8CqTVrJQ47aVaxSmIvMmDyKQDPXl1CMf

Other video:
Primitive Technology: Hobbit House https://www.youtube.com/watch?v=baZ5PdOdiqM

Primitive Technology: Grilling Meat With Waterwheels https://www.youtube.com/watch?v=hMc6f9Rzi3c