The Secret Treasures of Tiangong: the Tomb at the Bottom of the East China Sea

Being haunted by a family curse, I accidentally saw my great-grandfather who was supposed to have died during the Republic of China on a thousand-year-old mural in southern Yunnan. What was even more bizarre was that he was smiling strangely at me, pointing at the newly unearthed jade pendant in my backpack. On the last blank page of my grandfather's notes, writing suddenly appeared: "Hurry to the East China Sea, under the bronze door, there is the secret treasure of the Heavenly Palace." The female expert who was accompanying me turned pale and held my hand firmly: "That place is not in the sea at all..." "But thirty thousand meters away from the center of the earth, in the ruins of a civilization that should have slept forever."