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Guinness World Records
⏱️ Verified for 2026
What is the world's longest underwater tunnel?
Verified Answer
Seikan Tunnel
Quiz Options
- Seikan Tunnel
- Channel Tunnel
- Ryfast Tunnel
- Marmaray Tunnel
Explanation & Context
The Seikan Tunnel in Japan, which includes underwater sections, is considered the longest railway tunnel with a significant underwater portion.
Also Asked As / Semantic Queries
"Which is the world's longest underwater tunnel?"
Authoritative Sources & Citations
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