Dynamite was a high-explosive mixture containing nitroglycerin. It was used by Marty McFly and Emmett Brown to blast their way into the Delgado Mine on November 14, 1955, when they recovered the DeLorean time machine where Doc's 1985 counterpart had hidden it after becoming stranded in 1885 when the DeLorean was struck by lightning on the night of November 12. Bearing in mind the size of the resulting explosion and the amount of dirt and debris that rained down on them afterwards, it was fortunate that Doc and Marty were wearing miners' helmets at the time.