after uncovering coordinates in the lost river leading to the blood kelp biome, you arrive at a architect research facility. You had to stealthily get in since a juvenile gargantuan leviathan is right above the facility, when you do get in you see a big egg frozen in some sort of stasis. You take the giant egg and your PDA starts speaking.

PDA: this egg is abnormally large and likely hosts the embryo of a leviathan-class lifeform. Caution is advise if trying to hatch in alien Containment.