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you probably got this covered already but one thing to be sure is you have proper footwear for walking in water.
is there water flowing in this pipe now?
will there be much water flowing when your in there?
Think about what it might be like in there if you plan on going very far for very long. if your just wearing regular hiking boots/shoes and if water ends up going over top of boot, and take on water, you will get tired of walking around in wet shoes for the rest of the day.
it can be uncomfortable and ruin the fun of exploring. just a thought.