With Pea Gravel
He ensured that nothing could go in or out. He also made sure that this door would swing inward and served as a one-way entrance. The biggest error he could have made was to make a hole too small for the container.
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A Professional Touch
He checked that the hole would be at least two feet deeper than its height. He gave it an allowance of two feet on all sides where it would be placed and more room around where it would swing out.