From the Lumbridge Swamp Caves using a candle lantern (or black candle lantern) in the backpack, in case you fall short the jumps on to stepping stones and "swim towards the surface area", you might receive a candle (or black candle) plus some broken glass. The pre set up procedure https://raymondpeyfh.ttblogs.com/11331857/5-essential-elements-for-replace-glass