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And you've never broken through the ceiling of a large chasm and fallen to your death, or into lava?
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Take ten sticks, a stone pick, and - say - ten or fifteen lumps of dirt with you. It doesn't matter if you die and lose this stuff, and if you get something really good - vast horde of coal, a good amount of iron or redstone or some diamonds - just build straight back up again with that dirt and all the cobble you got from digging down.
Store your loot, and try again somewhere else.