Mud flood

There is definitely water involved in whatever was happening and and don't want people to know that because this is clearly half buried because its a water gate but the official narrative is that its a castle Fort wall and this was just a gate

That's clearly a water gate

River no longer there but there's a straight road.
Cathedral is built on top of a hill so this river ran either next to the Cathedral or underground

So we know water, sound and light is involved in whatever they were doing.

No water within a mile and that water is at the bottom of the hill so the only way there possibly can be water at the top of the hill as that illustration suggests is from the road that I have said

I'm thinking they used one of these water mills to turn a mechanism within the cathedral.. powering something...
So the buildings didn't harness electricity from the ether, they used water as if you look at pyramids etc they are built next to water.
Nuclear power stations, next to water.

Water is the easiest way of collecting free energy, you only need to use a water wheel

Cologne cathedral, next to water

Barcelona cathedral next to water

York minster/cathedral next to water

Notre Dame next to water