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It might be a good idea to seperate urine from solid waste. The urine could be pumped underground outsied into an underground dranage system. Maby a 5 gallon bucket with gravel in it and holes...

If you had to spend two weeks underground, could you use 5 gallon buckets with a vent tube in the lid leading outside. the idea would be to cap the bucket until you needed it. the gas would be vented...