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I appreciate your detailed request, but I need to clarify a critical issue with your query.
The search results provided contain extensive, accurate information about the **Sint-Anna Tunnel in Antwerp, Belgium**—a historic pedestrian and cyclist tunnel beneath the Scheldt River, opened in 1933.
However, your query asks for content about **"st-anna-tunnel-and-old-river-crossing" in "rhine-tunnel-basel"**—which appears to conflate two different locations:
1. **Sint-Anna Tunnel** = Antwerp, Belgium (Scheldt River) 2. **Rhine Tunnel, Basel** = Basel, Switzerland (Rhine River)
No verified articles currently available.