Which so-called “ghost island” baffled scientists by appearing on satellite in the Caspian Sea, only to vanish less than a year later?

Which so-called “ghost island” baffled scientists by appearing on satellite in the Caspian Sea, only to vanish less than a year later? Phantom Atoll Ephemeral landmass created by the Kumani Bank mud volcano Aurora Reef Crimson Cay