CONGO GOLD - Five million people have died in the Democratic Republic of Congo in a war fueled primarily from gold mined in the country by warlords and smuggled out to be sold on the open market. Scott Pelley reports. Solly Granatstein and Nicole Young are the producers. THE GREAT EXPLORER - Robert Ballard discovered the Titanic, the Bismarck and the PT 109 and now 60 MINUTES cameras are there for his latest discovery, 1,500 feet down in the Aegean Sea off Turkey. Lara Logan reports. Max McClellan is the producer. THIS IS A DOUBLE-LENGTH SEGMENT.