It's a movie about a big growth or something like that.
I starts with some workers who discovers like a grave under the earth. When they open this grave, there is the weirdest thing in it. Like a creature/human being. And the this growth begins to grow fast, and it's like killing everyone on its way. It's growing all over earth and 2 people are trying to find out, how to stop it. I don't know if this growth may be some kind of plant/treestuff, but it can't be stopped, until someone goes back to the grave and I don't know, kills the creature one time for all, or something.
I THINK that the movie starts with the letter O, but I'm not sure, since I've already tried that on Google.
Hope to hear from some smart heads in here :)