Longest undersea tunnel section
The current longest undersea tunnel section record is 23.5 miles, held by Channel Tunnel, set on May 6, 1994. Last checked October 10, 2026.
23.5
miles
Channel Tunnel
- Holder
- Channel Tunnel
- Record
- 23.5 miles
- Metric
- 37.9 km
- Exact figure
- 37.9 km (23.5 mi) under the sea
- Location
- English Channel, UK and France
- Date set
- May 6, 1994
- Last checked
- October 10, 2026
Sources
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