First thing that came to my mind is a chemical tracer. Like they add dye to underwater rivers to see where it comes out. Making maps of Vatican tunnels?
I know it is not near, but at the same time these are old building with old history. Like the tunnels around Ukraine and Russia, there have to be many around these old areas. The news reports this is as tracer dye, so there is more validity to this than at first guessed. Need to find Nick Cage to explore these tunnel systems for us.
First thing that came to my mind is a chemical tracer. Like they add dye to underwater rivers to see where it comes out. Making maps of Vatican tunnels?
Vatican is nowhere near Venice but I suppose they have properties worldwide
I know it is not near, but at the same time these are old building with old history. Like the tunnels around Ukraine and Russia, there have to be many around these old areas. The news reports this is as tracer dye, so there is more validity to this than at first guessed. Need to find Nick Cage to explore these tunnel systems for us.
oh good thought
It's been verified by Weather channel, it is dye. https://weather.com/travel/video/part-of-green-venice-canal-mystery-solved?cm_ven=hp-slot-2
You are very smart. This is very interesting. Please let me know if you learn more and I will do the same.