Deep study

OCEANOLOGY

This field explores the mysteries beneath the waves, from marine life to underwater geology. Think of Jacques Cousteau’s area of expertise.

"Deep study" hints at both the literal and figurative meaning of the answer. "Deep" suggests the ocean, while "study" points to a field of research—combining them gives "oceanology," the scientific study of the sea. The clue plays on the double meaning of "deep" as both a physical depth and an intense focus, making it a straightforward but clever wordplay.