Playthrough of the original in the series. Mass Effect Gameplay Walkthrough without ANY commentary, 1080p 60 FPS. Metgos is a large terrestrial planet with an atmosphere of carbon dioxide and nitrogen. Its hot surface is mainly composed of nickel with deposits of potassium and heavy metals. It is a mineralogical treasure trove, with concentrated heavy elements constantly being brought to the surface by volcanic activity. Metgos is inhospitable and dangerous, and expeditions must be well-prepared to survive any length of time. With its high mass, heat-trapping clouds and constant volcanic venting, Metgos seems well on its way to becoming a Venusian "pressure cooker" world.