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It’s not very deep when considering how deep the ocean actually is at its deepest point.

Marine - Offshore Waters

Offshore waters extend from about ten miles beyond the coast to the edge of the continental shelf making this area the state’s largest aquatic habitat. Depths vary from 50 feet to well over 600 feet, providing habitat for free-swimming and well as bottom- dwelling organisms.

https://www.dnr.sc.gov/marine/habitat/offshorewaters.html#:~:text=Offshore%20waters%20extend%20from%20about%20ten%20miles%20beyond,for%20free-swimming%20and%20well%20as%20bottom-%20dwelling%20organisms.

[freepersup]

Essentially a topographical map of the undersea.

https://usa.fishermap.org/depth-map/atlantic-ocean/#map