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It's not exclusive to cliffs, since the same can be achieved with 4x4 ring of chests and a car in the middle. Place all the chests but one, get in the car, place the last one so you can't exit the car with ENTER, and then mining your own car kills you. Ideally players would be prevented from mining their car(nothing happens) the same way ENTER does nothing when you're enclosed. Is this a feature? Save files attached for cliff setup and chest setup.