In March 2023, we explored the Infernillo sumps as part of Proyecto Espeleológico Purificación (PEP). PEP has been dedicated to exploring and researching the Purificacion karst caves in northeastern Mexico since the 1970s. The Purificación cave system, located in Tamaulipas, Mexico, now extends to more than 100 km long and nearly 1 km deep. The sumps located in the lower part of the cave, near the Infernillo Entrance, were first explored in 1993 and last in 2001, until underwater exploration resumed in 2022, revealing new passages to this remarkable system.