What is this?

Images: 

I was diving in Indonesia and found this.  No one on the ship knew what it was...

Nudibranch?

Looks like a nudibranch, although I'm not sure what species exactly.

Other possibility

It could possibly be a species of Sea Cucumber, since all the large tentacles seem to be coming from the mouth end, which is similar to the Hidden Sea Cucumber Pseudothyone belli in the Caribbean.

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