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    Re: Sperm whale buoyancy.
    From: Fred Hebard
    Date: 2007 Mar 25, 18:57 -0400

    Wouldn't the pressure difference be provided by the sea in the form
    of the collapsed lungs?
    On Mar 25, 2007, at 1:24 PM, George Huxtable wrote:
    > That mechanism for avoiding the "bends" seems plausible, but there's a
    > question occurs to me that isn't answered. As explained by Watson,
    > those air receptacles, being in the head, are many feet below the lung
    > area, when the whale is diving, almost vertically, with its head down.
    > So how does the whale ensure that the remaining bubble of air,
    > shrinking as it compresses, doesn't float upwards into the lungs, but
    > instead stays down at the head-end? That must be achieved by some sort
    > of muscular control of the chest cavity to provide the necessary
    > several-pounds-per-square-inch of pressure difference.
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