C1899 A Dead Man Six Hundred Years Ago(part Ii)

What happened? What happened here six hundred years ago? Why did all these crew members suddenly die here? Why were their corpses able to maintain six hundred years of incorruptible immortality, and even able to stand up straight like living people?

The corpses gradually surfaced. For a moment, the wide expanse of the sea was filled with corpses with cold glints in their eyes