Tunnel | KidzSearch. Family-friendly safe search for kids.

A tunnel for car movement in Hamburg, Germany.

A tunnel is an underground passage. Some tunnels are used for cars, and others are used for trains. Sometimes, a tunnel is used for movement of ships. Some tunnels are built for communication cables and some are built for electricity cables. Other tunnels are built for animals.

North portal of Milford railway tunnel, England.

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