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I appreciate your detailed request, but I must clarify a significant issue with the query itself.
The search results provided contain information exclusively about **Sint-Annatunnel in Antwerp, Belgium**. There is no overlap or connection between Sint-Annatunnel and Thames Foot Tunnel (which are located in two entirely different cities—Antwerp and London, respectively).
Your query asks me to provide comprehensive content about pursuing "st-anna-tunnel-and-old-river-crossing" **in** "thames-foot-tunnel"—which is geographically and logistically impossible. These are separate structures under different rivers (Scheldt River vs. River Thames) in different countries (Belgium vs. United Kingdom).
**To proceed effectively, I need clarification:**
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