Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Historical, past and present.

Dr Robert Ballard, National Geographic and the U.S. Navy support teams do a fantastic job!!!--This film is dedicated to someone who I believe is Dr Ballards son, Todd.I believe his son is in this footage, assiting in the survey for the Bismark.--Dr Ballard, Im sorry for your loss. I hope it finds a place in your heart that you shared your work with your son, and its preserved on film forever, on such a historical challenge.The mix of historical footage, interviews with the remaining survivors of WWII that took part, well done folks!!