Last year, an intriguing theory was put forward: black holes could be causing dark energy. As more black holes formed in the Universe, the stronger the pressure from dark energy. Now, a survey from the Dark Energy Spectroscopic Instrument (DESI) is strengthening the case for this theory. The first year's data from the survey show that the density of dark energy increases over time in a way that seems to correlate with the number and mass of black holes.