Prehistoric Farm Sunken Grotto: Sea Reptile Egg Activity

Understand the named Prehistoric Farm Sunken Grotto egg activity and distinguish it from fossil extraction and the Mosasaurus encounter.

The Sunken Grotto in Prehistoric Farm is named in the official exploration description as the place to sneak in and steal sea reptile eggs. The verified objective is that egg activity; precise coordinates, approach directions and interaction controls are not established here.

This short gameplay video introduces sea exploration and the giant creature encounter. It provides target-game context, rather than a verified route into the grotto.

Match the destination to the egg objective

Choose the Sunken Grotto activity when the game presents the sea reptile egg objective. It is different from completing Cambrian fossils and taking them to Dr. Ivy. Searching an ordinary fossil Dig Site does not follow the named grotto acquisition path.

The official wording identifies sneaking and stealing eggs. It does not specify a damage threshold, guard pattern, respawn timer or universal safe approach. Follow the actual location and interaction in your session rather than relying on a guessed route.

Separate the grotto from other sea results

The game also describes open-sea fishing and diving for rare catches. Those activities share a sea setting but do not establish the same input or reward. A fishing collection entry is not evidence that a particular grotto egg is obtained by ordinary casting.

The cooperative Mosasaurus activity uses spears. The official description lists it separately from the grotto egg activity, so do not assume defeating that creature is a prerequisite for every egg theft.

Use the next guide for the task you chose

Use sea reptile eggs for the acquisition distinction or Mosasaurus for the cooperative encounter. The beginner guide provides a concrete fossil-to-egg route if your immediate goal is raising a first creature.

Before spending on an assumed grotto requirement, check the actual destination instructions. No particular boat price, shovel tier or dive key is established as the access gate by the named egg activity alone.