Pact with the Strongest Tribe 

The spaceship of the Black Plain Empire could not only fly through wormholes and the air but also navigate like a submarine.

When they arrived above the location of the submarine city, the group on it did what they had to do and entered the sea, still traveling at high speed.

It wasn't possible to sail at the same speed as they could fly through the air. But even so, it could still sail underwater at more than 500 kilometers per hour, and it could withstand the pressure of the water at the bottom of the sea.

In a matter of seconds, that ship passed through the dark zone of the sea and reached the deepest part of that place, where a group of gigantic Sky Whales were already moving against them.

"Those..."

"Aliens?" Some of the Demigods imagined this was the case when they saw this spaceship since no one in the Spiritual World had yet shown such development to be able to use this kind of technology.