In one of my totes I have seen worms back up after I removed the lid. They are photophobic and were trying to get out of the light the quickest way possible.

Worms do a Michael Jackson "moon-walk" to shed their clitium~ They also do a good breakdance when you touch them! I can't imagine them getting stuck wtth their tight turning radius.

I've also seen them moving in both directions, to escape the light. In the heavy cardboard tubing (from rolls of fabric) which I had buried in the bin (to supply extra air and which were completely filled with castings and cocoons); I found worms in every single layer (alive and well). Also inside every tea bag. I have a hard time believing the worms could become trapped unless the cardboard was really dry. Good reason to keep it on the wet side. Also, this last bin that I just transferred, at the bottom there was a bit of standing water (maybe 1/2"), with bunches of wet, mushy cardboard; and every bunch chock, filled with worms.

Shaul