The developer names the Sunken Grotto as the place to sneak into and take sea reptile eggs. Treat this as an exploration objective; the entry route, pickup control and egg use are still unconfirmed here.
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Know which egg route you are pursuing
The Grotto objective is listed separately from Dr. Ivy’s fossil-to-egg process. Do not spend time completing a fossil set expecting it to be the documented requirement for a Grotto egg.
Prepare to identify the objective
Use the in-game location and item labels when you reach the area. Before relying on a route, confirm that it names Sunken Grotto and sea reptile eggs in this Project Mirvy game.
After finding an egg
The public description does not establish a hatch process, sale value or respawn timer for these eggs. Do not assume the dinosaur incubator rules apply to them.
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Choose the guide that matches the step you are working on next.