It´s good practice and basic knowledge for all diver professionals to understand and know how a compressor works. It´s the core! So here are Giorgio and Ping learning to fill up cylinders. Normally it´s Mashek job to do so, but today he is wearing the “teacher clothing” and explaining us what to do and how to do it properly. Theoretically is not very complicated, but becomes tricky if you don´t pay attention. The first lesson was very interesting, but not enough: ready for lesson two!