Figure 3. View from the behavioral chamber looking upwards, under full and partial polarization (FP and PP, respectively).

The DISC was manually rotated 360° counterclockwise, at increments of ∼45° (A–H), while scuba-diving at a depth of 9 m. Red arrow indicate the filter’s e-vector orientation. Photos were taken on the 18^th of November 2013 at 14∶35–14∶50. Solar elevation at the time was approximately 21° from the horizon, and the sky was clear.