🙋 I saw this too

What is this? Captured off the coast of Athens, Greece with a Lumix GH5. Highest ISO, f4.0 aperture (lens was bad) 14-140mm zoom. 180d shutter.Athens, Attica, Greece

Did you see the same thing — or something like it — at the same time? Add your own account. Several independent witnesses is the strongest evidence a sighting can have.