They shall bring thee down to the pit, and thou shalt die the deaths of them that are slain in the midst of the seas.
They shall bring thee down to the pit - i:e., the bottom of the sea; the image being that of one conquered in a sea-fight.
And thou shalt die the deaths - plural, as various kinds of deaths are meant (Jeremiah 16:4).
Of them that are slain in the midst of the seas - literally, pierced through. Such deaths as those pierced with many wounds die.