Special Relativity Is a Subset of General Relativity

Special relativity is a subset of general relativity under the conditions that basically the universe is mostly empty. The rules of special relativity do assume that there are no heavy masses. But even though it applies to boring situations, it's still true, right? Like, it still applies to the whole universe. And so if you have big masses around curving space, you can't use calculations from special relativity. Youe got to use general relativity. So i guess then the irony is that special relativity is actually specially boy relativity, but it gives rise to these really strange situations about the universe that don't seem to make sense. It's pretty weird stuff, yes.