I knocked down some termite shelter tubes. They were under my house. Where have the termites gone? Will they come back?

Sorry, but you've probably done the wrong thing. The termites can switch to another path into the house that you can't find. Trouble is, you exterminator may not find it either. It is almost always better not to disturb them until you have a proper inspection done and decided on the right response strategy. Instead of slowing them down, you have likely slowed yourself and it may end up costing you a bit more to be rid of them.  Sometimes the termites will quickly repair a damaged tube but some species will stay away for a long ime and a few may not ever come back.