Charles Ellicott Commentary Nehemiah 9:11

"And thou didst divide the sea before them, so that they went through the midst of the sea on the dry land; and their pursuers thou didst cast into the depths, as a stone into the mighty waters." — Nehemiah 9:11 (ASV)

As a stone into the mighty waters —Compare the Song of Moses, and mark in the Hebrew both the identity and the variation.