You start your journey in a  room made of lustrous transition metal with a silver color, low density, and high strength. The element the walls of this room are made of has an atomic mass of around 47 and an atomic number of 22. They are resistant to corrosion in seawater, aqua regia, and chlorine.

 If you think you know what this room is made of, carve its symbol in your journal and try to open the lock using it.

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