Tuna Tree presents 6 mysterious sounds from
the ocean
Number one: In 1991 the Pacific Marine Environmental
Lab started listening to, and taping, underwater
sounds in the world's oceans using SOSUS.
One of the first sounds recorded was 'upsweep'
which, as the names suggests, is an upsweeping
noise lasting around seven seconds in each
cycle.
The sound alters between seasons with the
lowest volume in winter and summer.
Upsweep occurs in between South America and
Australia and so far, what it is or why it
behaves as it does isn't known.
The main idea is that it is somehow affected
by volcanic activity.
Number Two: Discovered in 1997 by the National
Oceanic and Atmospheric Administration, the
Whislte was only recorded on a single hydrophone.
We know almost nothing about this mysterious
sound.
Number Three: Another 1997 sound is Bloop.
In fact, it was only heard through the summer
of 97 and no one knows quite what it was.
It was located west of the very bottom of
South America and was enormously powerful.
Listening stations spanning thousands of miles
recorded the super-low frequency sound and
although it's thought to have resonated from
an icequake, there are some other more creative
theories.
Due to the location, there has been speculation
over how imaginary writer, HP Lovecraft's
sunken city really is.
In his tale, a hybrid of a man, octopus and
dragon, which he called C-thul-hu, is said
to be sleeping.
At any rate, if Bloop was made by an animal,
scientists are sure that it is something bigger
than a blue whale.
Number Four: In 1999 'Julia' was so loud it
was heard on all of the hydrophones in the
Equatorial Pacific Ocean.
It has a duration of 15 seconds and is thought
to have been the sound of the grounding of
an iceberg in the Antarctic.
Number Five: This sound was heard in 1997
and has popped up on monitors every now and
again since then.
Named 'Slow Down' because the frequency literally
slows down, it lasts around 7 minutes.
An iceberg is the most popular source but
there are those who are sure it is a giant
squid.
Number Six: Heard literally all around the
globe, the Hum has been popping up over 50
years now.
Not everyone can hear this humming but those
who can describe it as incredibly annoying
and impossible to get away from.
You're more likely to hear it if you're aged
between 55 and 70 although it is only decipherable
by 2% of people.
Apparently the source is completely unknown
but it's heard when inside and increases in
volume during the night.
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