As we all know, there are many build projects that require certain preconditions so that they can be built. Recently the question came up (on the German civforum.de), what happens to such a project currently under construction, if the prerequisite meanwhile "got lost". This may be quite important if the project in question is a Wonder like the Statue of Zeus, and you lose your ivory resource while the thing is still under construction... As quite a few surprising results turned up, I thought it might be worth it to translate it and post it here as a strategy article. Units There are many military units, which require certain strategic resources in order to be built: horses, iron, saltpeter, rubber, oil, aluminium, uranium. All military units can be completed, even if the resource(s) got lost in the meantime. Of course, no new units can be started, until the resource(s) in question get reconnected. Nuclear Weapons can be completed, even if the city, which built the Manhattan Project, is destroyed in the meantime. And what is most strange: you can even start new Nuclear Weapons, even though the Manhattan Project - like all Great Wonders - cannot be rebuilt once it has been destroyed! Worker Tasks Workers currently building a railway segment can finish it, even if iron or coal are lost in the meantime. Great Wonders A Great Wonder can be completed, even if it becomes obsolete in the meantime. Obsolete Wonders are still capable of triggering a GA. It is no longer possible to start a Wonder, after it has become obsolete. The Statue of Zeus can be completed, even if ivory is lost in the meantime. The Manhattan Project can be completed, even if uranium is lost in the meantime. Small Wonders Heroic Epic and Military Academy can be completed, even if the victorious Army is lost in the meantime. (In fact: you can even start these two Small Wonders, after the Army has died! It is only necessary to have had an Army victory once in the past.) The Pentagon can not be completed, if the number of Armies sinks below 3. (*) The Forbidden Palace can not be completed, if the number of towns falls below the required number of towns. (*) The Secret Police Headquarter can not be completed, if you revolt into a new form of government. (*) If you complete it while being in Communism and then revolt into some other government, it looks like it "disappears" from the improvement list of the city that built it. However, when revolting back to Communism afterwards, it will "reappear" in that city and continue to provide the usual benefit. The Battlefield Medicine can not be completed, if the number of hospitals in your empire falls below 5. (*) The Wall Street can not be completed, if the number of stock exchanges in your empire falls below 5. (*) The Strategic Missile Defense (SDI) can be completed, even if the number of SAM missile batteries in your empire falls below 5. The Apollo Program can be completed, even if aluminium is lost in the meantime. Open question: can the Iron Works be completed, if the iron or coal resource inside the BFC of the city gets "exhausted"? As the exhaustion of a strategic resource happens at random, this case is quite hard to test... (*) The build project is changed interturn to some randomly selected project, and that project will not even complete that interturn, even if the shieldbox had way above the required number of shields. Spaceship Parts Spaceship Parts can be completed, even if the city with the Apollo Program is lost in the meantime. (Of course you can't start new Spaceship Parts until you built a new Apollo Program. SS Thrusters, SS Cockpit, SS Docking Bay, SS Engine, SS Life Support System, SS Stasis Chamber, SS Storage/Supply, SS Planetary Party Lounge and SS Exterior Casing can be completed, even if aluminium is lost in the meantime. SS Fuel Cells and SS Stasis Chamber can be completed, even if uranium is lost in the meantime. SS Exterior Casing can be completed, even if rubber is lost in the meantime.