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** While the average human is ''slightly'' less dense than pure water, the emphasis here is on the "slightly". Further, fat is less dense than muscle and bone, and Jack is a pretty skinny guy, so his overall density would be slightly higher than the average. Thick, heavy clothing (like, say, the kind of clothes that people wear during cold winter days) could easily have been dense enough to overcome that slight positive buoyancy and drag Jack to the bottom.
