The first full-scale oceanographic research expedition was conducted by the:

although a case can be made for earlier, I would give James Cook the credit

https://en.wikipedia.org/wiki/Oceanography#History

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After pressing enter or clicking on the search button, you will see a list of search results related to your query. It is important to critically evaluate the sources and choose a reliable one. Look for well-known oceanographic institutions, books, or reputable educational websites to find accurate information.

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Please note that as an AI language model, I do not have real-time access to the internet or the ability to browse search engines.