I just saw the creature in the top right corner. At first, I thought it was a salp because of the internal basket-like structure but that doesn't work as it's in the Mediterranean. Any idea what it is?
Sorry for the delay with my reply. It is a tail of a #Doliolid, made of budding new organisms (the mother organism is just behind the image margin). It is a tricky view, the perspective makes the tail hardly recognizable.
Hope you're enjoying the project. Keep asking when having troubles with the ID. We're happy to help 😃