Detailed text transcripts for TV channel - KGO - 20140515:08:46:00
Effect that occurred in indonesia in the indian ocean where hundreds of thousands of people died. >> reporter: the conditions are so dangerous to man, dr. ballard and his seem are relying on hercules, a 5,000-pound submersible to be their eyes and ears inside the volcano. this is the season's final dive. >> now we are reaching the top of the volcano. >> we're in it. we're inside the crater. you can see it is surrounded by -- we're inside. >> oh, wow. >> reporter: on its journey, hercules is doing more than taking breathtaking pictures. it is collecting samples, making maps and reaching right i...