The search term is a product of internet legends and horror stories.
In the world of Minecraft urban legends, Alpha 0.0.0 is described as a "lost" or "abandoned" version found on obscure Russian pirating sites.
In Minecraft Alpha 0.0.1a, you'll find a very basic, blocky world made up of... well, blocks. The game was still in its infancy, and the core concept was far from polished. You'll spawn in a randomly generated world, and your goal is to survive and explore.