CUIZ-FACT-BC2E8FEB hard Guinness World Records ⏱️ Verified for 2026

What is the longest underwater tunnel?

Verified Answer
Channel Tunnel (UK-France)

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Explanation & Context

The Channel Tunnel, connecting England and France, is the longest underwater rail tunnel, spanning 50.45 kilometers (31.35 miles), with 37.9 kilometers (23.5 miles) under the seabed.

Also Asked As / Semantic Queries
"Which is the longest underwater tunnel?"
Authoritative Sources & Citations
Guinness World Records Official Database ↗

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