Daniel Butler in his book claims that the lusitania was in alot better shape when Light dived on her than when Ballard explored her. claiming that the superstructure and funnels were intact (funnels in Debri field close to wreck) and that hull was in better condition. i think it is possible he could be right. Andrea Doria looked alot better 10 or 11 years ago, and same goes for titanic when ballard discovered her. but im not a scientist so i cant be exactly sure, hopefully someone with experience in this field will notice this.