Cooper falls into the black hole and finds himself in a four-dimensional tesseract, where he travels through time and space and finds himself able to manipulate the falling dust grains in his childhood home, allowing him to send the NASA site coordinates to his past self and bootstrap his mission. He also deduces that the tesseract itself was constructed by a future generation of humankind to similarly guide their predecessors. He and TARS transmit information from within the black hole by manipulating the hands of Murph's wristwatch. Using the information, Murph solves the gravity manipulation problem and enables humanity to escape extinction and build colonies in outer space.