Wow. I thought deep cave diving was for the risk takers. Sounds like Bikini Atoll is a new one to add to the list.
I wonder what the signal would be to tell your partner their skeleton is glowing through the wetsuit.
But seriously, there are a few places divers tend to avoid due to pollution, enviromental toxins such as dissolved Hydrogen Sulfide, or even too high a salt concentration (Dead Sea). There is a book on Amazon.com that has a chapter on diving in polluted waters, I just didn't get the title at the time.