Let me propose this for a storage tunnel;
25-meter diameter "pipe" in the middle for two-way traffic flow, offset at 45-degree angles (facing towards the entrance, for ease of loading/unloading) are square bays, each measuring 50-meters deep, 20-meters high, and 30-meters wide (this should allow a maximum of 2 shipping containers deep, 2 high and 3 wide, with inspection passages around each set), each bay separated by, say a 15-meter thick plug of rock (for support).
If I have the sizes right, you are looking at 12 standard shipping containers or 96 pallets (these could be stacked up 4 high) on warehouse racks.
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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