How is it possible for the people who? are hands-on developing something to not know what it is?
It seems to me? that's like saying that Edison had no idea what he was working on when he was developing the electric light bulb.? Or the? phonograph.? Or the movie camera.? ?He was clueless; they were "mysterious projects".?
Edison & Co. may not know what Bismarck intends to do with what they have developed, but they gotta know what the contrivance? they've worked on can do.
And so must producers and directors.
As Blake Snyder (of "Save the Cat" fame) might say, describing something as a "mysterious project"? amounts to hiding the game ball.