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Dr. Donald 'Ducky' Mallard: It's not very deep.Special Agent Leroy Jethro Gibbs: Hastily-dug graves rarely are.Dr. Donald 'Ducky' Mallard: Do you know why graves are six feet deep, Gibbs?Special Agent Leroy Jethro Gibbs: I do.Dr. Donald 'Ducky' Mallard: Yeah, six feet is the minimum depth at which the smell of a decomposing corpse cannot attract wild animals. Of course, there are exceptions. A polar bear can smell...Special Agent Leroy Jethro Gibbs: Duck, I said I knew.

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