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Shipping Container Tunnel Shipping container tunnels, also known as double-end doors, have standard double-doors on both ends of containers. When opened, they create a tunnel. This facilitates easy access and greatly increases the convenience of loading and unloading cargo. Tunnel containers can be bought in a "one-trip" condition that can be used for a variety of storage or conversion projects. Many customers use tunnel containers to create small storage units for secure storage - simply by dividing the