After 43 years of repose, Taal Volcano erupted on 12 January 2020 forming hazardous base surges. Using field, remote sensing (i.e. UAV and LiDAR), and numerical methods, we gathered primary data to generate well-constrained empirical information on dune bedform characteristics, impact dynamic pressures and velocities of base surges to advance our knowledge on this hazard to understand and evaluate its consequences and risks. The base surges traveled at 50-60 km/hr near the crater and decelerated before making impact on coastal communities with dynamic pressures of at least 1.7-2.1 kPa. The base surges killed more than a thousand livestock in the southeast of Taal Volcano Island, and then traveled another 600 meters offshore. This work is a rare document of a complete, fresh and practically undisturbed base surge deposit, important in the study of dune deposits formed by volcanic, and other processes on Earth and other planets.