You might want to have a look at this: https://www.youtube.com/watch?v=0csd3M4bc0Q
It's an 11-minute video in which Dr. Sternberg and Paul Nelson explain their position very clearly. What they're arguing is that whale evolution required several different co-ordinated mutations. For example, whales have internal testicles, but these require a cooling system to be in place,or whales won't be able to reproduce successfully. However, the cooling system only makes sense if there are internal testicles already in place. So the two had to appear at the same time. And there are many other things that needed to be co-ordinated as well. Sternberg and Nelson then cite Durrett and Schmidt's 2008 paper, "Waiting for two mutations: with applications to regulatory sequence evolution and the limits of Darwinian evolution" (see https://www.ncbi.nlm.nih.gov/pubmed/18791261 ) which basically says (according to Sternberg & Nelson) that if you need two co-ordinated mutations to occur, then you'll have to wait for over 100 million years for them to occur together. Since whales evolved over 10 million years at most, whale evolution refutes the hypothesis that whales appeared by an unguided, incremental, Darwinian process. That's the kind of evolution they're taking aim at.
It seems to me that their argument would collapse if there turned out to be a single gene regulating both the development of cooling systems and internal testes. I'm not sure, but the INSL3 gene might be one such candidate. What do you think?
Re INSL3, please see here: