This will be an invited talk at the ASL 2014 North American Annual Meeting (May 19-22, 2014) in the special session Set Theory in Honor of Rich Laver, organized by Bill Mitchell and Jean Larson.

**Abstract. ** The large cardinal indestructibility phenomenon, discovered by Richard Laver with his seminal result on supercompact cardinals, is by now often seen as pervasive in the large cardinal hierarchy. Nevertheless, a new never-indestrucible phenomenon has emerged. Superstrong cardinals, for example, are never Laver indestructible. Similarly, almost huge cardinals, huge cardinals, superhuge cardinals, rank-into-rank cardinals, extendible cardinals, 1-extendible cardinals, 0-extendible cardinals, weakly superstrong cardinals, uplifting cardinals, pseudo-uplifting cardinals, superstrongly unfoldable cardinals, $\Sigma_n$-reflecting cardinals, $\Sigma_n$-correct cardinals and $\Sigma_n$-extendible cardinals (all for $n\geq 3$) are never Laver indestructible. The proof involves a detailed technical analysis of the complexity of the definition in Laver’s theorem on the definability of the ground model, thereby involving and extending results in set-theoretic geology. This is joint work between myself and Joan Bagaria, Kostas Tasprounis and Toshimichi Usuba.

Yes!!! I’m looking forward to this talk.

By the way, I just answered a question sort of related to indestructibility over on MO. I hope I didn’t mis-characterize your results.

Oh, yes, I saw your answer there, thanks! I added a few references to the papers to which I think you were referring.

And I’ll be glad to meet you in Boulder.

I miss both Rich Laver and Boulder.