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24 February, 18:57

How did early explorers determine the depth of and ocean

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  1. 24 February, 19:26
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    The first instrument used was called the sounding weight. (a weight made of lead, roughly 5kgs in weight).

    In the early 1900's they began using sonar systems to detect sound from deep down and also a submarine that could contain a max of 3 people.
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