Scientists found four jet black eggs in the deep ocean in the abyssopelagic zone, from a flatworm species previously unknown to science
https://www.popularmechanics.com/science/animals/a71783510/black-eggs-flatworms-emerged-from-ocean/
Popular Mechanics4 Black Eggs Surfaced From the Dark Heart of the Ocean—With Alien Creatures InsideThese spheres from the abyss conceal creatures with startling biology.