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myNotes

10 y the time of his last balloon Piccard and Walsh recorded the depth
Badventure, Auguste Piccard knew that of water under the Trieste with an electrical
device called an echo sounder.
the principles of his pressurized cabin could
also take him to the depths of the ocean.
Working with his son, Jacques, he began to
4
design an extraordinary deep-sea craft, or

bathyscaphe. They named it the Trieste.
11 Instead of a balloon canopy, the Trieste 1 3
had a long cylinder-shaped float. Inside
the float were a large gas tank and two air
tanks. Gasoline and air are lighter than
KEY
water, so when all three tanks were full, the
1. Transmitter sends
craft remained on the surface. To make it sound waves
down to the
sink, the air tanks were flooded with
bottom of the sea.
seawater. The float also contained two
2. Sound waves hit
hoppers filled with iron pellets to release the sea floor
and return to the
when the bathyscaphe needed to rise again. transmitter.
12 An airtight cabin was welded beneath 3. Receiver picks
up sound waves
the float. Like the cabin of the FNRS, it
coming up from
was a perfect sphere, but instead of the bottom
of the sea.
aluminum, its walls were forged in steel 5
4. The time
inches thick. It had two windows made of difference
between the
strong artificial glass called Lucite. And it
sound transmitted
had an air supply and purification system and the sound
received is
that allowed two crew members to breathe
measured
safely for up to twenty-four hours. electronically,
giving the depth.
13 Built in Italy, the Trieste was bought
by the U.S. Navy in 1958. The following
year, the freighter Santa Maria transported
it west from California to Guam. The
USS Wandank then towed it to a site 2

above the deepest part of all the world’s
seas: the mysterious Challenger Deep.

forged A metal object that was forged was heated
in a special furnace and hammered into shape.

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