"I'm going a little deeper," announced Tom, toward evening on
the first day of the voyage on the open ocean. "I want to see how
she stands the pressure at five hundred feet. I feel certain she
will, and even at a greater depth. But if there's anything wrong
we want to correct it before we get too far away from home. We're
going down again, deeper than before."
A little later the submarine began the descent into the lower
ocean depths. From three hundred and fifty feet she went to four
hundred, and when the hand on the gauge showed four hundred and
fifty there was a tense moment. If anything went wrong now there
would be serious trouble.
But Tom Swift and his men had done their work well. The M. N. 1
stood the strain, and when the gauge showed four hundred and
ninety feet Mr. Damon gave a faint cheer.
"Bless my apple dumpling, Tom!" he replied, "this is
wonderful."
"Oh, we've been deeper than this," replied the young inventor,
"but under different conditions. I'm glad to see how well she is
standing it, though."
Suddenly, as the needle pointer on the depth gauge showed five
hundred and two feet, there came a slight jar and vibration that
was felt throughout the craft.
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