It's bad that these 2 died, but I have to believe they had to have know the risks involved.  I think so many of us, even knowing the risks, think that "it can't happen to me" and do things we shouldn't.  It's so sad for their families!  I'm not sure what is the right thing to do.  Signs are posted, and divers know the risks.  But would it be better to permanently close the area?  I'm on the fence.