If you build Dr. Vu's tower, you'll have access to disasters. When you release a disaster, a certain number of buildings will be destroyed, and the population within each of those buildings will be lost as well. To rebuild, you'll have to provide whatever items it is requesting. Unlike a brand new building, you only have to fulfill the construction order once. Upon completion the building will return to it's former glory, your population will return, and you'll receive a specified number of golden keys as a reward.
As you complete disaster challenges, you'll be rewarded with Vu points. Eventually, you'll max out on points and be given the opportunity to pay for an upgrade. As you complete each upgrade, you gain access to new disasters, which also offer greater numbers of golden keys as a reward. There are 18 levels in all. Here's the breakdown on costs.
|Vu Upgrade Cost|
The upgrades get very expensive, but it's awesome being able to complete a disaster challenge and be rewarded with 7 golden keys per Robot disaster when you're fully maxed out. The disaster rebuilds are generally a lot easier than boat shipments, which is an extra benefit to using Vu disasters versus the boats.