Or mtsolah {mets-o-law'}; also mtsuwlah {mets-oo-law'}; or mtsulah {mets-oo-law'}; from the same as tsuwlah; a deep place (of water or mud) -- bottom, deep, depth.
KJV: And thou didst divide the sea before them, so that they went through the midst of the sea on the dry land; and their persecutors thou threwest into the deeps, as a stone into the mighty waters.
NASB: "You divided the sea before them, So they passed through the midst of the sea on dry ground; And their pursuers You hurled into the depths, Like a stone into raging waters.