Posted by cherenkovdept just so i don't get any gnarly surprises, how tall should my boots be and is it just water?
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tall enough to not get wet if you don't like getting wet, but it is just water, you could go in sandals too.
the bigger concern underground is air quality. you should do some research on things like airflow, venting, contamination and egress.
and do bring that friend. people have died doing this solo.