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A comment on Almost 25% of world’s seafloor now mapped. Parent comment

Re:Almost 25% of world’s seafloor now mapped by iamgopal on Monday October 17, 2022 @09:15PM (#33241826)
Can’t we just use some form of ultrasonic wave from one end and detect at other end ?
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Re:Almost 25% of world’s seafloor now mapped by wincy on Monday October 17, 2022 @09:43PM (#33242002)
I’d imagine the amount of energy you’d have to push into the water would be insane to hear it 1500 miles away, wouldn’t it?
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Re:Almost 25% of world’s seafloor now mapped by naavis on Tuesday October 18, 2022 @08:06AM (#33245995)
Whale noises travel thousands of kilometers underwater. https://en.wikipedia.org/wiki/Whale_vocalization
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Re:Almost 25% of world’s seafloor now mapped by totalZero on Wednesday October 19, 2022 @11:44AM (#33263861)
There's an inverse relationship between wavelength and range, and the higher the frequency the better the resolution.

https://acousticstoday.org/wavelength

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Re:Almost 25% of world’s seafloor now mapped by alanbernstein on Monday October 17, 2022 @09:48PM (#33242042)
What other end?
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Re:Almost 25% of world’s seafloor now mapped by BurningFrog on Monday October 17, 2022 @10:03PM (#33242122)
Pour in some traceable mix of chemicals, and see if it turns up somewhere.
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Re:Almost 25% of world’s seafloor now mapped by tuatoru on Monday October 17, 2022 @10:25PM (#33242259)
There're these fish called the Devil's Hole Pupfish. Can't do that.
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Re:Almost 25% of world’s seafloor now mapped by BurningFrog on Monday October 17, 2022 @11:16PM (#33242568)
There is a near infinite number of non toxic chemicals to choose from.
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Re:Almost 25% of world’s seafloor now mapped by tuatoru on Monday October 17, 2022 @11:21PM (#33242596)
Ah, but can you show that they're not toxic to Devil's Hole Pupfish? And the population is tiny and fragile--you're not allowed any test subjects.
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Re:Almost 25% of world’s seafloor now mapped by BurningFrog on Tuesday October 18, 2022 @12:58AM (#33243143)
There might well be 5 separate regulations forbidding it. That's a different question.

The safest class of substances I can think of are unusual isotopes.

They're chemically identical to the regular elements, which is what matters for life forms, but can be detected by scientific instruments.

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Re:Almost 25% of world’s seafloor now mapped by MichaelCollins on Monday October 17, 2022 @10:34PM (#33242325)
You'd deafen the poor troglobites.
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