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Harris asked, "Sure you can find your way underwater in the dark?" "We have wrist compasses with luminous dials," Scotty explained. "Good. Any danger of you comin' up under me?" "No. We'll see the white bubbles from your prop. They'll be phosphorescent." Rick pointed to the crab boat's wake.
Particularly with stealthy systems, this will present a unique challenge to military systems where one may not expect a great amount of "spin-on" from the commercial sector. It is vitally important to be able to sense the enemy under all conditions and environments. Sensors must penetrate foliage and walls and detect threats such as underground and underwater mines.
As a consequence, the whole of our five ships hit her together on the broadside, tearing her planking with their underwater beaks, and sinking her before we had backed clear from the engage. But if we thus brought the enemy's number down to five, and so equal to our own, the advantage did not remain with us for long.
"No, professor, but it needs electricity to run, batteries to generate its electricity, sodium to feed its batteries, coal to make its sodium, and coalfields from which to dig its coal. Now then, right at this spot the sea covers entire forests that sank underwater in prehistoric times; today, turned to stone, transformed into carbon fuel, they offer me inexhaustible coal mines."
She was 59 feet long and would make a striking exhibit placed next to one of the new German submersible cruisers which exceed 300 feet and have a displacement of 5000 tons. These first Holland ships which long constituted the entire underwater force of the United States were but trivial affairs compared with the modern vessel.
It was clear they had come upon the gold boxes, and they wished to impress upon the visitors, in underwater dumb show, that the find had only been made that very minute. It was a strange enough performance. Half-seen hands snapped red fingers in triumph. Ponderously booted feet did a dance of ecstasy in three feet of gluey mud.
In essence, manatees, like seals, are designed to graze the underwater prairies, destroying the clusters of weeds that obstruct the mouths of tropical rivers. "And do you know," I added, "what happened since man has almost completely wiped out these beneficial races? Rotting weeds have poisoned the air, and this poisoned air causes the yellow fever that devastates these wonderful countries.
Rick waited until last, and called, "Everybody getting air?" When they nodded, he put his own mouthpiece in place, checked to make sure the demand valve was working, then slipped the mask down from his forehead and went underwater. There was a convenient sandy space among the rocks at the fifty-foot level. He reached it and turned to count noses. All were present. Visibility was good enough.
What an agonizing day I spent, torn between my desire to regain my free will and my regret at abandoning this marvelous Nautilus, leaving my underwater research incomplete!
This is shown as well at the base ball grounds at the end of the sixth inning when "all stretch" as it was in the old time underwater boats. The crews now have space in which to loaf and even the strain of long silent watches under water is relieved by the use of talking machines and musical instruments.
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