> to do that you would have to start mass manufacturing a vacine a somehow administer it to the whole population secretly.

To play devil's advocate:

This could be happening _right now_.

1) Create and release CoVid.

2) Engineer a vaccine, that also protects against a secondary, 100% deadly virus. (SinoVac?)

3) Vaccinate your own population.

4) Release the super-deadly, secret 2nd virus.

5) Profit.

> it is to big a project to not leak just based on everyone involved having to not tell anyone.

Yeah. This where it, and most of the other grand conspiracy theories, start to become unrealistic. It would be impossible to keep the secret from coming out.

But it would make a great plot for thriller novel.