Curtain Wall, Calcite Light

A flowstone curtain hangs mid-passage, maybe three millimetres thick at its lower hem — thin enough that my strobe passes through it and turns it amber before the edges bleed back into cold blue. I spent two dives just positioning the light source behind the formation to find the angle where the translucency held without blowing out the banding. The silt on the cave floor stayed undisturbed; I was very careful about that.