And
indeed many a person is nervous going down in a submarine for the
first time. "Still we can't go more than thirty feet down in this
water," went on Tom. "A better test will be when we get about
five hundred feet below the surface. That's a real test, though
as far as knowing it is concerned, a person can't tell ten feet
from ten hundred in a submarine under water, unless he watches
the gauge."
"Well, I think you'll find Mr. Hardley all right," said Mr.
Damon, who seemed to have taken a strong liking to his new
friend.
Certainly the latter showed no signs of nervousness as the
craft slowly settled to the proper depth. He asked numberless
questions, showing his interest in the operation of the M. N. 1,
but he showed not the least sign of fear. However, as Tom said,
that might come later.
"We are going down now," Tom explained, as he pointed out to
Mr. Hardley the various controlling wheels and levers, "by
filling our ballast tanks with water. We can rise, when needful,
by forcing out this water by means of compressed air.
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