The walls you are pushing to force your way through are getting wetter. Like a nose full of gushy snot. It makes the going easier but the stuff is dripping all over you and the smell is repulsive. The walls are closing in, and you are swimming and pushing through, holding your breath as the unseen slime covers your body and face, and then with a flex, resist, flex, POP your out. You take in a series of deep breathes. You rub and fling away the slime from your mouths. You are on a beach of blue pebbles. A faint light ahead reveals cave walls on either side of you. Squishy noises around like. Like mucous creature slithering unseen.