Martial Arts? Sorry, I am better at Thunder Spell!

Chapter 444: 249 Thunder Dragon Sky Seal (Please subscribe! Please vote monthly!)_2

Professor Cao, Professor Zhou, and the others continued on their journey.

They traversed the corridor.

From this new corridor, no more murals appeared.

It seemed that the legend of Sima Pi ended once they entered the Immortal Road.

Perhaps the ancients who painted those murals had also no clue about what Sima Pi encountered after he entered the Immortal Road.

They passed through the corridor.

Suddenly, the space in front of everyone opened up.

An unprecedentedly massive soluble cave appeared before them.

This underground soluble cave was like nothing anyone had ever seen before; was the Zombie soluble cave that could accommodate tens of thousands of coffins large enough?

But compared to this place, it was still inferior.

Here, the space was at least ten times larger than the Zombie soluble cave that Professor Cao and the others had seen before!

It was hard to imagine that beneath the old forests of the Yunnan deep mountains, there could be such an enormous space in the Underworld.

But that was not the most unimaginable part.

What really made everyone gasp in shock

was the magnificent underground palace standing in the midst of this enormous cave.

No one knew when this underground palace was built.

It was of immense scale.

The entire structure was greyish-white,

appearing extremely ancient.

But upon closer inspection, remnants of immortal essence could still be sensed.

Professor Cao couldn’t help but say, “Could it be that immortals really lived here before? Is this palace, the travel palace of immortals?”

An underground palace of this size existed in the Underworld.

Was it really possible to be made by human hands?