I will briefly describe the discovery of Gaia BH3, the properties of the binary system composed of the 33-solar-mass Gaia BH3 plus a metal-poor subgiant, and its scientific significance. The pair was discovered in 2023 during the validation of preliminary data, and was released on April 16, 2024. Along with Gaia BH1 and Gaia BH2, there are three astrometrically discovered "dormant" black holes. In 2026, Gaia DR4 will very probably release a significantly larger number of them.