Problems in the movie Interstellar.

Every rivet they hit may be a bullet. I don't remember this line.

But I think there may be two different meanings for you to understand.

One is that we assembled the strength of all mankind to build these spaceships, immigrant ships and probe ships, thus canceling the space agency, the army and the war. So every rivet they hit may turn out to be the steel core of a bullet or other weapon. We have done our best to accumulate resources for the world.

On the other hand, the uneven internal and external pressure will cause the rivets that are not firmly fixed to become bullets. In the movie, the spaceship in artificial gravity environment flies around the immigration station, describing the spaceship and so on. It is the result of rushing to work, and the quality assurance may not be in place. If the theoretical guarantee is not in place, all kinds of disasters will occur. However, because the time for the destruction of the earth waits for no one, human beings have done their best.