Question: When was the final tunnel joint installed on the only way across the Lingdingyang other than the Humen Pearl River Bridge?
Sentence (from "Shiziyang"): Shiziyang () or Shizi Channel, the upper channel of the Pearl River estuary, it runs from the confluence of the Dong River and the Pearl River with parts of the Bei River to the Bocca Tigris which separate Lingdingyang the mid channel of the Pearl River Estuary in the south.
Relevant evidence: No