The space underground was vast, and there was a mountain in front which looked like the upper body of a giant sculpture. It was incomparably huge, and its whole body was covered in pitch black rocks, but the nose, eyes, mouth, and ears were all sculpted in detail.
Since only the upper body could be seen, the lower body had to be buried in the ground. Otherwise, not sculpted at all.
Behind the sculpture, an ancient ship floated in mid-air. Half of it was in the space underground while the other half had gone through a huge gate. There were beehive seals on it, but the bow of this ship had pierced through them, entering the other world.
That seal had to be the Youdu seal that the white bats had mentioned.