Well we had a good rain event last night and it only traveled a foot the other direction now, What I now see what had happened - the contractor did not complete the pond in one visit, and there is a separation of the core (see picture). So it looks like they did not know where they stopped and started a few feet away when they returned. Also there is a small slide on my pond embankment right where this stops and a pipe formed between the snafu. This is where the sink hole started in the first place.
I also believe it finally collapsed on itself as it really did not creep this time - just sunk another 6" and never held water before. So like what was said earlier in the comments, all my missing dirt is in the pond.
So - I just need to get it dry enough so they can get an excavator here to fix, ah-ha this is why I could stick a 3 foot rod into the crevice there as the core stopped.
