The creatures u see is not any existing living creatures in the world. It is my own version of sea creatures trying to extract the plants juice. The plants and the creatures both are partly organic and partly mechanic. As people will asked, why 'fly'? It is because the first intention is to creating is a fly like creature in the land but after a saw a book of FX on underwater, I decided to create an underwater scene instead. But I still use the same title. Note, special attention is given to create the faded effect of the plants into the depth of the sea ( refer to Fly-s01 ).