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The Advantages of the 40 Ft Tunnel Container Also called tunnel shipping containers or double door containers, 40 ft HC DD DCs are one foot taller than normal height cargo containers. They have a set of double doors on both sides. They can be transported by ship, truck or train. The dual access point enables seamless loading and unloading in warehouses, shipping yards or during transportation. The heightened design also increases storage capacity. Storage Space A 40 ft tunnel container