In Game of Thrones, we can see in the episode "The Long Night" that the dead can be resurrected from the underground crypts. 

Why didn't the Night King resurrect Viserion under water? Why did he have to make so much effort with poor wights with huge chains to extract the dragon from the deep?

Discussion about whether Viserion is a wight or White Walker is available in [here](https://movies.stackexchange.com/questions/79207/is-this-thing-a-wight-or-a-white-walker).