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It soon became apparent that there was nothing mystical about the vanishing of Donna Noble . Down on the coast was a small dock , barely noticeable from the cliff top where we had previously stood . In a bid to make a quick buck , and raise themselves from the poverty they were forced to inhabit ; a few local people had set up a Ferry business , taking holiday makers over to the next island for ridiculously high prices . The reason why Donna 's DNA trail vanished , was because the ocean had taken away any trace of her .
What might have happened before this disappearance ?