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〃Fine！〃 cried Captain Weston； with more enthusiasm than he had yet
manifested。 〃That's great； if you don't mind me mentioning it。 How deep
are we？〃
Tom glanced at a gage on the side of the pilot tower。
〃Only about sixty feet；〃 he answered。
〃Then don't go any deeper！〃 cried the captain hastily。 〃I know these
waters around here； and that's about all the depth you've got。 You'll be on
the bottom in a minute。〃
〃I intend to get on the bottom after a while；〃 said Mr。 Swift； 〃but not
here。 I want to try for a greater distance under water before I come to rest
on the ocean's bed。 But I think we are deep enough for a test。 Tom； close
the tank intake pipes and we'll see how the Advance will progress when
fully submerged。〃
The hissing stopped； and then； wishing to see how the motors and
other machinery would work； the aged inventor and his son； accompanied
by Captain Weston； descended from the conning tower； by means of an
inner stairway； to the interior of the ship。 The submarine could be steered
and managed from below or above。 She was now floating about sixty…five
feet below the surface of the bay。
〃Well； how do you like it？〃 asked Tom of Mr。 Damon； as he saw his
friend in an easy chair in the living…room or main cabin of the craft；
looking out of one of the plate…glass windows on the side。
〃Bless my spectacles； it's the most wonderful thing I ever dreamed of！〃
cried the queer character； as he peered at the mass of water before him。
〃To think that I'm away down under the surface； and yet as dry as a bone。
Bless my necktie； but it's great！ What are we going to do now？〃
〃Go forward；〃 replied the young inventor。
〃Perhaps I had better make an observation；〃 suggested Captain Weston；
taking his telescope from under his arm； where he had carried it since
entering the craft； and opening it。 〃We may run afoul of something； if you
don't mind me mentioning such a disagreeable subject。〃 Then； as he
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TOM SWIFT AND HIS SUBMARINE BOAT （or Under the Ocean for Sunken Treasure）
thought of the impossibility of using his glass under water； he closed it。
〃I shall have little use for this here； I'm afraid；〃 he remarked with a
smile。 〃Well； there's some consolation。 We're not likely to meet many
ships in this part of the ocean。 Other vessels are fond enough of remaining
on the surface。 I fancy we shall have the depths to ourselves； unless we
meet a Government submarine； and they are hardly able to go as deep as
we can。 No； I guess we won't run into anything and I can put this glass
away。〃
〃Unless we run into Berg and his crowd；〃 suggested Tom in a low
voice。
〃Ha！ ha！〃 laughed Captain Weston； for he did not want Mr。 Swift to
worry over the unscrupulous agent。 〃No； I don't believe we'll meet them；
Tom。 I guess Berg is trying to work out the longitude and latitude I gave
him。 I wish I could see his face when he realizes that he's been deceived
by that fake map。〃
〃Well； I hope he doesn't discover it too soon and trail us；〃 went on the
lad。 〃But they're going to start the machinery now。 I suppose you and I had
better take charge of the steering of the craft。 Dad will want to be in the
engine…room。〃
〃All right；〃 replied the captain； and he moved forward with the lad to a
small compartment； shut off from the living…room； that served as a pilot
house when the conning tower was not used。 The same levers； wheels and
valves were there as up above； and the submarine could be managed as
well from there as from the other place。
〃Is everything all right？〃 asked Mn Swift as he went into the engine…
room； where Garret Jackson and Mr。 Sharp were busy with oil cans。
〃Everything；〃 replied the balloonist。 〃Are you going to start now？〃
〃Yes； we're deep enough for a speed trial。 We'll go out to sea； however；
and try for a lower depth record； as soon as there's enough water。 Start the
engine。〃
A moment later the powerful electric currents were flowing into the
forward and aft plates； and the Advance began to gather way； forging
through the water。
〃Straight ahead； out to sea； Tom；〃 called his father to him。
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TOM SWIFT AND HIS SUBMARINE BOAT （or Under the Ocean for Sunken Treasure）
〃Aye； aye； sir；〃 responded the youth。
〃Ha！ Quite seaman…like； if you don't mind a reference to it；〃
commented Captain Weston with a smile。 〃Mind your helm； boy； for you
don't want to poke her nose into a mud bank； or run up on a shoal。〃
〃Suppose you steer？〃 suggested the lad。 〃I'd rather take lessons for a
while。〃
〃All right。 Perhaps it will be safer。 I know these waters from the top；
though I can't say as much for the bottom。 However； I know where the
shoals are。〃
The powerful searchlight was turned； so as to send its beams along the
path which the submarine was to follow； and then； as she gathered speed；
she shot ahead； gliding through the waters like a fish。
Mr。 Damon divided his time between the forward pilot…room； the
living…apartment； and the place where Mr。 Swift； Garret Jackson and Mr。
Sharp were working over the engines。 Every few minutes he would bless
some part of himself； his clothing； or the ship。 Finally the old man settled
down to look through the plate…glass windows in the main apartment。
On and on went the submarine。 She behaved perfectly； and was under
excellent control。 Some times Tom； at the request of his father； would send
her toward the surface by means of the deflecting rudder。 Then she would
dive to the bottom again。 Once； as a test； she was sent obliquely to the
surface； her tower just emerging； and then she darted downward again；
like a porpoise that had come up to roll over； and suddenly concluded to
seek the depths。 In fact； had any one seen the maneuver they would have
imagined the craft was a big fish disporting itself。
Captain Weston remained at Tom's side； giving him instructions； and
watching the compass in order to direct the steering so as to avoid
collisions。 For an hour or more the craft was sent almost straight ahead at
medium speed。 Then Mr。 Swift； joining his son and the captain； remarked：
〃How about depth of water here； Captain Weston？〃
〃You've got more than a mile。〃
〃Good！ Then I'm going down to the bottom of the sea！ Tom； fill the
tanks sti