Movie 2.

Timelapse video of Mxyine limosa burrowing within gelatin viewed with photoelastic setup. Placing crossed polarizers on either side of the chamber allows one to visualize stress development in the gelatin when and where the hagfish pushes on it. Appearance of the gelatin suggests that it is getting chopped up into pieces rather than cleanly fracturing as seen in some polychaetes. Patterns of stress development in the gel around the burrowing hagfish are consistent with an internal concertina mechanism of burrowing. Video is sped up 4x.