Isaac Asimov
could survive the turbulence …”
    Michaels said, “Captain, if you stay away from the artery walls, you will be in the region of laminar flow—no turbulence to speak of. We will be in the artery only for minutes and once in the smaller vessels, we will have no problem. The only place where we would not be able to avoid killing turbulence would be in the heart itself and we would go nowhere near the heart. —May I continue, now?”
    “Please do,” said Carter.
    “Having reached the clot, it will be destroyed by a laser beam. The laser and its beam, having been miniaturized in proportion, will not, if properly used—as in Duval’s hands it is sure to be—do any damage to the brain or even the blood vessel itself. Nor will it be necessary to demolish every vestige of the clot. It will be enough to break it up into fragments. The white blood cells will then take care of it.
    “We will leave the vicinity at once, of course, returning by way of the venous system, until we reach the base of the neck where we will be removed from the jugular vein.”
    Grant said, “How will anyone know where we are and when?”
    Carter said, “Michaels will be piloting you and see to it that you are in the right place at all times. You will be in communication with us by radio …”
    “You don’t know if that will work,” put in Owens. “There’s a problem in adapting the radio waves across the miniaturization gap, and no one has ever tried this big a gap.”
    “True, but
we
will try. In addition, the
Proteus
is nuclear powered and we will be able to trace its radioactivity, also across the gap. —You will have just sixty minutes, gentlemen.”
    Grant said, “You mean we have to complete the job and be out in sixty minutes.”
    “Exactly sixty. Your size will have been adjusted to that, which should be ample time. If you stay for a longer interval, you will start enlarging automatically. We can keep you down no longer. If we had Benes’ knowledge we could keep you down indefinitely but if we had his knowledge …”
    “This trip would be unnecessary,” said Grant, sardonically.
    “Exactly. And if you begin enlarging within Benes’ body, you will become large enough to attract the attention of the body defenses, and shortly thereafter, you will kill Benes. You will see to it that this does not happen.”
    Carter then looked about. “Any further remarks? —In that case, you will begin preparations. We’d like to make entry into Benes as quickly as possible.”

CHAPTER 5

Submarine
     
    The level of activity in the hospital room had reached the visual analog of a scream. Everyone was moving at a rapid walk, almost a half-run. Only the figure on the operating table was still. A heavy thermal blanket lay over it, the numerous coils snaking through it, filled with their circulating refrigerant. And under it was the nude body, chilled to the point where life within it was a sluggish whisper.
    Benes’ head was now shaven and marked off like a nautical chart in numbered lines of latitude and longitude. On his sleep-sunk face was a look of sadness, frozen deeply in.
    On the wall behind him was another reproduction of the circulatory system, enlarged to the point where the chest, neck and head were sufficient in themselves to cover the wall from end to end and floor to ceiling. It had become a forest in which the large vessels were as thick as a man’s arm while the fine capillaries fuzzed all the spaces between.
    In the control tower, brooding over the operation room, Carter and Reid watched. They could see the desk-level banks of monitors, at each of which a technician sat, each in his CMDF uniform, a symphony in zippered white.
    Carter moved to the window, while Reid said softly into a mike, “Bring the
Proteus
into the Miniaturization Room.”
    It was customary protocol to give such orders in a quiet voice, and there was quiet on the floor, if absence of sound was the mere criteria. Last-minute adjustments were being

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