So I've only had one other snail die on me (well, I've had pond snails die on me but I didn't care so much about them), so I'm not sure if this one is dead or not. Anyway, a few days ago I moved my ivory mystery snail out of the tank he/she had shared with my golden mystery snail. I intended to move the golden one too, but he/she didn't want to let go of the side of the tank. I figured I'd try later. Well, then he/she disappeared (this all occurred on the 19th of May). I didn't see him/her yesterday either. So, this morning I picked up the cave I had for them to hide in and he/she was upside down with their body hanging out of their shell. I picked him/her up and no movement. However, there is no smell and last time my snail died he/she disintegrated when I picked him/her up and smelled horrible.
I moved him/her into a cup to watch. There has been no movement for the past few hours and he/she is still hanging out of the shell. When I say hanging out of their shell I mean he/she is out as though he/she is climbing up a wall or cruising on the bottom on the tank, but is actually upside down attached to nothing.