Crossword Genius

Sort of study carried out by bathyscaphe? (2,5)

Ross

I believe the answer is:

in depth

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(Other definitions for in depth that I've seen before include "Thoroughly and comprehensively" , "Profoundly" , "Swimmer so able to touch bottom" , "Detailed sort of investigation" , "comprehensive" .)

I've seen this clue in The Globe and Mail.
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