You are one of the marine creatures that live near the surface under the sea. In underwater society, there are two categories without counting ordinary marine creatures (fish, starfish, etc.); sea ​​creatures like you and deep sea creatures... who live deep in the water as their name suggests. One day, you decided to defy the ban by venturing to the depths of the sea and you saw a shadow pass quickly far in front of you but you could not distinguish what it was