Answer: DEEPENS

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Intensifies we know 6 Answers
Strengthens we know 6 Answers
Becomes more profound we know 1 Answer
Dredges we know 1 Answer
Goes lower we know 1 Answer
Gets more profound we know 1 Answer
Gets more interesting, say we know 1 Answer
Gets more complicated we know 1 Answer
Falls more we know 1 Answer
Extends farther down we know 1 Answer
Excavates further we know 1 Answer
Becomes profound we know 1 Answer

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