jig73:
The way I parsed 13:
Fathoms of God = FOG. (initial letters)
Hope reduced in half with two letter for fleet giving Siren.
I have 10 first letters from across clues and 13 from down clues.
I am missing one which may be from 21a or 29a.
Down clues I have (3, 10) with 10 letter word hyphenated, I think.
I need help on 21a, 18d and 29a. to complete the grid.