Tunnels

You decide to use your arms to yank the tentacle off your leg. You grab the tentacle and try to push it off. It didn't work, the tentacle is pulling you more into the depths of the water. You try again, fortunately, this time it worked! You then swim back up to the surface quickly and run out of the water. As you get onto the surface you see a hole going through the wall. As you go into the hole you see a claw come out from under the water. "What the-" you say. Your voice is cut off by a loud splash from the water. A giant squid-like head pops out from under the water and yells. "EEEEEEEEEOOOOOOO!" It screams. Then it looks at you. Its beard of tentacles shakes the water off of it. It's glowing eyes look straight at you. Suddenly it gets out of the water and runs straight at you! It was massive, It was over 300 feet tall and had huge wings! Thankfully it, couldn't get to you because it couldn't fit inside. You then freak out and continue down the little tunnel.