Question: When was the final tunnel joint installed on the only way across the Lingdingyang other than the Humen Pearl River Bridge?
Sentence (from "Lingdingyang"): Currently, Humen Pearl River Bridge is the only bridge that crosses Lingdingyang at the northern end with Hong Kong–Zhuhai–Macau Bridge a bridge and tunnel across Lingdingyang is being built in the southern end of channel.
Relevant evidence: Yes