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What Is a Shipping Container Tunnel? Double end door containers, also known as tunnel containers are shipping containers with normal double doors on both ends. When open they're a tunnel! With two access points, they are a popular choice for storage. It is much easier to rotate the stock inside and out. Portable Space can also weld steel bulkheads in order to create two storage units of 10 feet from one tunnel container. Easy Access A shipping container tunnel is a container for cargo with double doors