Hunting Dark Matter in a Hidden Valley Room: 610 The search for DM has taken an interesting twist in the last years, abandoning main stream strategies and aiming at new theoretical and experimental paths to unveil Dark Matter nature. In this seminar I will present the latest LHC CMS results in the search for dark quarks appearing in collider detectors as partially visible jets of particles (Semivisible jets) and how developments are moving from this first result to enlarge the explorative territory. From new models, and experimental signatures to novel analysis techniques, I will discuss  new discover possibilities and how we can design model-agnostic searches using Autoencoders.