Комментарий о цитате к Тегилим 69:3

‎טבעו ARE SUNK — The root טבע always denotes sinking in slimy matter, as may be seen from (Psalms 69:3) “I am sunk (טבעתי) in deep mire”, and from (Jeremiah 38:6) “And Jeremiah sank (ויטבע) in the mire”. The fact that this expression is used teaches, therefore, that the sea became slime (cf. Rashi on 14:24) to requite them according to their own measure — because that they had made the Israelites work as slaves with slime and with bricks (Mekhilta).

a snail Heb. שבלול. Some interpret it as limace in Old French, a snail (as in Lev. 11:30). Others interpret it as שבֹּלת, a current of water (below 69:16). The “lammed” is doubled, as from (Job 18: 16): “his branch will be cut off (ימל) ; (below 90:6), “will be cut off (ימולל) and will dry up.”

צללו means THEY SANK, they went deep, — an expression of the same root as (Psalms 69:3) מצולה “the depths”.