I say that;<br/><br/>==> We attempt to loosen and pick up one of the illuminating crystals and carry with us, as a torch/lamp. Then slowly progress deeper into the cave.<br/><br/><span style="font-style: italic">Reasoning:</span><br/>Might be darker later on, and if we have to swim then the crystal might even works under water. ^^''<br/>A crystal might also be sharper and/or more blunt then our dull knife, (if it ever comes to fighting or knocking someone out  :3).<br/>Following the source of the water might lead to a way out?