Here's the chant tone:
The fifth verse (according to the chant's numbering) is "The floods | covered them;* they went down into the depths | like a stone." "Like a stone" is sung to the descending notes at the end of the second phrase (Bb A G), so there's a sense of that sinking.
The eighth verse is "You stretched out Your | right hand;* the earth | swallowed them." Here, "right hand" is sung with a melisma (G A | G), musically giving a sense of being "stretched out."
The tenth verse is "You will bring them in and plant them on Your own | mountain,* the place, O Lord, which You have made for | Your abode." This is probably a bit trivial, but the notes to which "mountain" is sung (G A G), look a bit like a mountain, with the A note as the summit.
The eleventh verse is "the sanctuary, O LORD, which Your hands have es- | tablished.* The LORD will reign forever and | ever." Here, "ever" is sung with a melisma (Bb A G), and since it's elongated, there's a sense of that duration.
