The Seven-Star Treasure Ship

Chen Mo led his team into the depths of the Arabian Sea, where they found a clue to the Imperial Seal among the wreckage of Zheng He's treasure ship.

Deep in the ship's hold, a submerged altar bore a recess for a rubbing of the Imperial Seal, guarded by a chart of the Twenty-Eight Lunar Mansions.

The instant Lin Xuan fitted the jade disc into the recess, the entire shipwreck began to shake.