hi Mike,

Tubular craters? Until you pointed out I hadn't thought about it. That is pretty odd.

As for the "plastic state" you mention, something comes to mind. As I recall when the volcanoes were spotted on Io it was attributed to gravitational flexing or a sort of tidal motion. Could something similar be happening here?

I can't really tell from the picture if the feature you mention is a blow out or a subsidence. Hmmm ... ?

Here are some more pictures from the imaging team:

http://ciclops.org/search.php?search=Hyperion

I going to look at these closer.

Dr. R.