Here David compares the way that Yahweh led the Isrealites through the Sea of Reeds to the way people can be led across the dry ground of a wilderness. "The depths" refers the riverbed that appeared after Yahweh parted the waters. Alternate translation: "through the Seas of Reeds on dry ground" (See: [[rc://en/ta/man/translate/figs-simile]] and [[rc://en/ta/man/translate/figs-metaphor]])