Twisted Eagle on Nostr: According to more sources: these are huge pumps, which eventually connect to a huge ...

According to more sources: these are huge pumps, which eventually connect to a huge pipe, to create a tremendous water surge. The pipe is inserted into the tunnel with the largest opening in the area, with the upper part of the tunnel sealed from above with cement, so that the water does not escape. There are photographs of buildings sinking into the tunnels route.