To keep the illusion of the tentacle, the end needs to be hidden by something. While working on the demo scene update, I found there was not enough length to go below ground to keep the tail-end from getting accidentally exposed. The colliders got in the way.
The current one (tentacle.prefab) has 13 colliders along the body:
So I've made some variants:
9 colliders, no head:
Since the colliders aren't affected by blendshapes changes, this gives the option to add some shape atoms as colliders and manually animate them for the head.
Double density. An experiment to see if it results in less bead-like collision. (capsule colliders seems to like to explode actors when put in series like this.)