Bikes in the Channel Tunnel

Pedal cycles are generally allowed to cross the Channel Tunnel, which connects the United Kingdom and France, via the Eurotunnel cycle service. This service uses a minibus and a bicycle trailer capable of carrying six bicycles. On a few occasions since 1993, cyclists have crossed directly through the Channel Tunnel's bidirectional service tunnel, located between the two rail tunnel bores. The service tunnel has airlocks at both ends and a concrete road surface.

Wikipedia ↗

Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).

Other tunnels in France

Delaware Aqueduct United States · 137 km Päijänne Water Tunnel Finland · 120 km Orange–Fish River Tunnel South Africa · 82.8 km Ishikawa Tunnel Japan · 78.5 km Brenner Base Tunnel Austria · 64 km Mont d'Ambin base tunnel France · 57.5 km Gotthard Base Tunnel Switzerland · 57.09 km Hong Kong–Zhuhai–Macau Bridge China · 55 km