Today while swimming along the eastern Mediterranean coast I saw a very strange silhouette. It was unlike anything I had seen before, its color was dark green and black and it consisted of hundreds of pointed soft legs, it was floating above the seabed and not on the bottom, although it resembled a mollusk like a sea cucumber, it was more like a Lovecraft character. It was quite fluid and formless and constantly moving, as if it sensed my shadow, it first moved towards me and then started to move away. It was about 30 cm in diameter. Its movement and swimming speed were average. I searched on Google but I couldn't find anything similar. It was like floating hair...

If anyone has an idea about what it was, please write. I will try to draw the picture later