Tragic story, this. I think we can all learn from this as well. Yes, we wreckdivers know all of the rules for safe diving, but this drives home the "why" of those safety procedures. This tragedy should serve as a reminder to all of us that penetration dives require a lot more planning and preparation. It should also remind us all that, as has been previously stated, don't over-estimate your abilities. I've done 5 penetration dives on WWII wrecks here in Egypt over the past three weeks. Thought I was doing everything right. After reading this story I've gone back to the books and found that I had done most things right, but could've done some things "righter" and safer.
I've also learned something from the other posters here. Not being a cave diver, I didn't know about the duct tape on the fin straps. Makes a heck-u-va lot of sense. Will now incorporate that into my dive preps for penetration dives.
Mike