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Oh Boy!, Looks like we've run into a little problem. How are you going to climb down the ladder with the lantern in one hand and the mop in the other?

tie one end of the rope around the shaft of the mop and slowly lower it down (mop part up) to the water until you feel it stop. then check it, yo

Yes! You can check the water depth by lowering the mop down with the rope. 1 Gold star for Zorkiii!