Q&A: how did HMS Challenger chart the mountains+valleys in the ocean floor in 1872?

Question by Wolf’s Frost: how did HMS Challenger chart the mountains+valleys in the ocean floor in 1872?
the answer to this question is really urgent, plz give me the answer if u know as soon as possible

Best answer:

Answer by nibblesthemouse
With very long bits of rope and a weight. And plenty of time.

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