hidden underworld

your a 27 year old girl/boy who was sailing on the ocean when you found a giant sink hole (water fall) in the middle of the ocean and you decide to check it out, but you got to close and you fell into the giant sink hole and somehow survived (unconcious). when you wake back up and looked around you saw a giant cave with thousands of dragons flying around (the hidden underworld) your goal is to survive as dragons found you and brought you to the dragon king (the bewilder beast). THANKS @Melinda12 FOR THE TALKIE IDEA