Out of the water, you strip down and wring out your clothes as best you can. Thankfully, they're wool, not cotton, so while they're still damp they can help you stay warm. After several minutes of twisting, you're satisfied that you've gotten nearly all of the water out. With this done, you scan the room you're in more carefully. About twenty yards away there is a stone shore, not simply a rock standing proud of the water. You check the water in between for anything you might cut yourself on, but the water looks clear and clean.
Holding the clothes and pack on your head with one hand for balance, you paddle your way over to the shore. The water is still quite cold, and you begin to worry about your core temperature dropping. You reach the shore without incident.
Rooting through the bag you find some thermal packs in the first aid kit that you twist to hear the pop, and feel the heat course through your fingers and hands. You hold them to your chest as you pull your clothes back on, and soon feel refreshed. Despairing, you realize that you lost your journal when you slipped down the waterfall. You won't be able to keep as detailed an account of the tunnels as you hoped. No matter, you're still alive and that's what matters. Shouldering the backpack, you examine the walls and find a single, large tunnel leading away from the water. Proceeding with caution, and with no way back the way you came in, you venture deeper into the cavern.