You struggle in the waves for a moment, before realizing that you have to get out of here. The Arcanine has no intention of sparing your life, and plans to make you into a mushy soup to absorb. So, you swim over to the churning walls. You swim around for a little while, feeling around them, when you find a small depression just below the "water" level. You press in it, and find a few flaps of flesh. Moving them aside, you see the entrance to a small tube. It curves after a small distance, and a thick gurgling sound is coming from inside it. You look to the tube, and back to the stomach you're in. You don't know what will happen if you go in the tube, but if you stay in here you'll surely be digested, and get to go in the tube later, as a mush.
