Precautions Precautions to take whilst draining Drain exploration, or urban speleology as it is also known, has certain risks implicit in its makeup. Avoid this by doing drains on sunny days. Another is the darkness, so take multiple torches in case one or two go wrong in the drain. Methane, an organic decomposition product from rubbish in drains, tends to flow on the ceiling so naturally no naked flames.
Drains are slippery and it is easy to fall over.
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