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with dread。 He went back to sleep; awakening only intermittently。
〃…since oxygen toxicity only occurs when the PO2 exceeds point 7 ATA for prolonged periods…
〃…nitrogen narcosis; in which nitrogen behaves like an anesthetic; will occur in mixed…gas atmospheres if partial pressures exceeds 1。5 ATA in the DDS…
〃…demand open circuit is generally preferable; but you will be using semiclosed circuit with inspired fluctuations of 608 to 760 millimeters…〃
He went back to sleep。
When it was over; they walked back to their rooms。 〃Did I miss anything?〃 Norman said。
〃Not really。〃 Harry shrugged。 〃Just a lot of physics。〃
In his tiny gray room; Norman got into bed。 The glowing wall clock said 2300。 It took him a while to figure out that that was 11:00 p。m。 In nine more hours; he thought; I will begin the descent。
Then he slept。
THE DEEP
DESCENT
In the morning light; the submarine Charon V bobbed on the surface; riding on a pontoon platform。 Bright yellow; it looked like a child's bathtub toy sitting on a deck of oildrums。
A rubber Zodiac launch took Norman over; and he climbed onto the platform; shook hands with the pilot; who could not have been more than eighteen; younger than his son; Tim。
〃Re