That Drop of Water

There are only 30 million years left until the heat death of the universe. This number is ridiculously short for a civilization that has existed for 96.7 Billion years. They decided to build an ark - not to escape, but to bring evidence of the existence of this civilization out of the universe before the end. The only problem is: no one knows what is outside the universe. The speed of light does not change, which is the only iron law here. But it is this iron law that tells them that no matter what is outside, it may be stranger than they think.