Happy that all's well that ends well, but for any parents considering this, trench collapses have killed hundreds of workers in just the past decade. Anything deeper than a couple feet might be a hazard that needs to be mitigated.
replyAlso depends on the local geology and how tenacious the kids are. I couldn't dig to dangerous depths as a kid even if I wanted to because the soil got way too rocky to dig through before 3 feet down.
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