Here's a proof of concept built around 620AD. Obviously a bit different but this type of technology has been around a long time. http://www.archaeology.co.uk/ar

Here's a proof of concept built around 620AD. Obviously a bit different but this type of technology has been around a long time. http://www.archaeology.co.uk/articles/features/harnessing-the-tides-excavating-the-earliest-mills-in-ireland.htm http://www.archaeology.co.uk/articles/features/harnessing-th...