answer. "I know you have the official hydrographic charts, but
there's a mistake, I'm sure. I once made a study of that part of
the ocean, and there are currents there at certain seasons of the
year that no one suspects, and deep caverns that aren't charted.
If the Pandora lies in one of these you'll need a great strength
of walls to your submarine to withstand the pressure of deep
water."

The craft Tom Swift proposed to use in searching for the
treasure ship Pandora was of the regular cigar-shape, but inside
it had many special features. It was more comfortable than the
usual submarine, not being intended for fighting, though it did
carry guns and a torpedo tube. Tom intended renaming the craft,
which had been called Advance, and one day, when there had been
some discussion as to what the undersea craft ought to be called,
Ned explained:

"Why don't you name it after her?"

"After whom?" inquired Tom, in some surprise, looking up from a
letter he was writing.

"Your friend and future wife, Mary Nestor," answered Ned. "I'm
sure she'd appreciate it."

"That isn't such a bad idea," conceded Tom musingly. "The only
thing about it is that I don't want Mary's name bandied about
that way."

"Use her initials, then," suggested Ned.