| rdfs:comment | - Having been inspired by Jules Verne's Journey to the Center of the Earth, Emmett Brown developed the idea of building a rocket-powered drill. He sent in a patent for it at the patent office, but never heard back, resulting in Emmett not pursuing the idea any further. That changed when Marty McFly traveled to June 13, 1931 to free the older Doc Brown from prison and needed the drill to do so. Marty approached the residential Emmett Brown to build it, and managed to convince him he was a scientist, though Emmett also figured he was from the patent office.
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| abstract | - Having been inspired by Jules Verne's Journey to the Center of the Earth, Emmett Brown developed the idea of building a rocket-powered drill. He sent in a patent for it at the patent office, but never heard back, resulting in Emmett not pursuing the idea any further. That changed when Marty McFly traveled to June 13, 1931 to free the older Doc Brown from prison and needed the drill to do so. Marty approached the residential Emmett Brown to build it, and managed to convince him he was a scientist, though Emmett also figured he was from the patent office. The only needed ingredient for the drill was alcohol, though acquiring it proved difficult due to prohibition. Marty and Emmett, however managed to get several barrels of alcohol from the Sisters of Mercy Soup Kitchen with some help from Edna Strickland (though she thought the barrels contained soup). After finishing the rocket-powered drill, Marty went to the Hill Valley Police Station to free Doc. Although the drill proved ineffective on the walls and fell apart, Marty, upon discovering that Doc was in a pattywagon, was able to make use of the rockets by placing them on Edna's bicycle. The rockets also proved useful in for Marty and Doc in escaping Irving "Kid" Tannen.
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