If you wanted to experience oxygen intoxication you had to strap a tank to your back and breathe the stuff in through a tube in the old way. But no one in his right mind would do that deliberately, for an excess of oxygen can be five-ways dangerous on a planet where what you have to worry about most is over-stimulation.
There were catwalks on both sides of the aerator walls, with a central lane wide enough for vehicles to pass in opposite directions. I kept to the right hand side all the way to the Colony, and it took me about thirty minutes to get there. My strength amazed me. It probably wasn't quite up to par. But I only had to stop twice to rest and then only for a minute or two.
Two ambulances passed me, their red tail-lights blinking, but the drivers didn't even turn their heads as the vehicles went droning through the Big Grayness. Up above the sunlight was waning, and turning red, but only a diffuse glow filled that two hundred-foot-high artificial cavern.
Three aerator-system workers, walking shoulder to shoulder, gave me a bad jolt for a moment, for they had the look of Wendel police agents. I encountered them just beyond a break in the cavern wall, where a cluster of pre-fabs with children playing in the yards made five or six acres of stony ground resemble a manufacturing town suburb Earthside.
I should have known better than to be alarmed, because the three men approaching me looked eager and expectant, as if they knew that a few steps more would bring relaxation after toil and the warmth and glow of a family reunion.
But they had the husky build and sharp-angled features of Wendel police officers and I stayed alert until one of them came to a dead halt and looked me over genially. "New on the job, aren't you, Buster? Don't remember having run into you before. They keep putting on so many new men it's hard to be sure."
"That's right," I said. "I live about two miles further on."
"Well, it isn't the best job in the world, Buster, as I guess you've found out already. You get sucked into a grill sometimes, and breathe nothing but oxygen until you feel like a blue baby they're trying their best to save, even if they have to fanny-whack him to get the stuff out of his lungs for a week or two afterwards."
"Don't discourage him, Pete," the tallest of the three chided. "You have a cold, cold heart. It doesn't happen often."
"You bet it doesn't ... or my wife would have been a widow long before this. Well ... good luck, Buster. Be seeing you around ... I hope."