250 dead people are currently frozen, waiting to be revived with future technology.
As of 2014, over 250 dead people are currently frozen waiting to be revived with future technology. The process of reviving dead bodies is called cryonics.
Unfortunately, everyone who has ever been frozen so far is essentially turned to mush. These people will never be revived. Cryonics in its current form is more of a religion than a science.