I think Ballard is just worried about the changes to the wreck. Some of the changes are man made but yet again we are talking about a ship thats been underwater for 100 years come Sunday. So being underwater all this time did take a toll and as a result Titanic has gotten to the point where she is very fragile. I think both Ballard and Cameron done well with there explorations to the wreck. But i feel as if the wreck did suffer man made damage.