I'm not sure what submarines have to do with human nature, but, in any case, William Saletan has devoted a column to discussion of the threat posed to the U.S. by submarine-operating terrorists. Saletan points out that drug cartels have used submersibles to good effect -- though the amount's debatable, he says they transport up to a third of the U.S. cocaine supply. Cartels value the subs because they're difficult to detect, and because they have heretofore enjoyed legal near-immunity. When a drug-carrying submarine is identified by the Coast Guard or the Navy, the crew abandons ship and scuttles the boat, sending the evidence to the bottom.