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Updated: June 23, 2025
Evidently the caissons must be filled with compressed air to equalize the external pressure, which is constantly increasing as ever deeper water is reached; they must also have an opening connecting with the surface; and to admit of passing from the ordinary atmosphere to the denser one, there must be an air-lock.
"Yes, sir?" replied Barret immediately. "Did you check the settings on all the rings in the firing chambers?" "Yes, sir," reported Barret. "They looked O.K. to me. Why don't you check with Connel? He supervised their installation." "That's true," said the major. "I'll go outside and look them over." Connel turned on his heel and hurried to the air-lock chamber.
Another closure in the outer shell made an air-lock. He took time for one grip at the hand of Spud O'Malley, one grin of excited, adventurous joy that wrinkled about his eyes behind the window of his helmet then he picked up a detonite pistol, examined again its charge of tiny shells, jammed it firmly into the holster at his waist and swung the big door shut behind him.
Coming out, I found, was really more dangerous than going in, for it is while coming out of the "air" that men are liable to get the bends. Roughly, half a minute should be consumed in coming out from each pound of pressure, though for such high pressures as we had been under, considerably more time was required in order to do it safely. We spent about half an hour in the air-lock, I should judge.
"Give me a change of scenery." The big Venusian turned to a locker, pulled out a bulky space suit, and climbed into it quickly. Adjusting the space helmet, he nodded at Roger and stepped into the air-lock chamber, pulling the hatch closed behind him.
A burly young man made his way through the throng about the entrance, nodded unconcernedly to the gatekeeper, and joined the stream of passengers flowing through the triple doors of the double air-lock and down a corridor to the center of the vessel.
They headed along the broader corridor which went past the indented inner door of the air lock. They had reached that indentation when Baird saw that the inner air-lock door was closing. He saw a human pressure suit past its edge. He saw the corner of some object that had been put down on the air-lock floor. Baird shouted, and rushed toward the lock.
Anchored in its exact position, it was slowly sunk by building the masonry of the tower upon it, and when the lower edges of the great box rested on the bottom of the river men were sent down through an air-lock which worked a good deal like the lock of a canal.
Yet something told him that unless he put his fate to the test now he would never return. He had the utmost confidence in Burke he might never be able to secure his services again no, it was now or never. He entered the air-lock, closing and bolting the door, and passed on into the chart room.
This consists of a barge fitted with an air-tight cabin provided with an air-lock, and having in the center of its floor a large oval opening, surrounded by a casing standing up above the water-line. In this casing, another casing slides telescopically, the upper part of which is connected to the top of the fixed casing by a leather "sleeve."
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