The wonderful and beautiful sea that stretches out endlessly is also mysterious.
But no one knows what's going on in the deep sea.

What happened?

Shark family friends are in danger
The mysterious and beautiful sea is turning into a strange and dangerous sea.

A mysterious journey in the sea on a submarine!
Save your friends from the bad guys in the dangerous waters.

Who can run further!
Do you collect more points?
See if you can save more friends!
Compete with users from all over the world and get the best points.

Run right now~

* Images posted as'pre-registration' are'development version' and'full version' may be different.