I decided to make a new unofficial element.  Metallic glass is meant to be a metal-glass hybrid that is conductive and won't break under pressure, while still maintaining the optical properties of glass.  I made the metal part out of titanium so the material would be impervious to pressure.  But in order to protect the glass from said pressure I had use titanium on the outside and this also blocks photons.  Any ideas on what I can do?

Good news, I tweaked it so it is more glass-like and still conducts electricity.  But it now requires a box of airblock wall to be immune to pressure.