TikvaNZ: I checked on this cache this morning and it has indeed gone, but the hint is still there. GZ was under at least 1m of water - fast flowing by the look of it. I wonder how far it went - it should have floated. Out to sea perhaps and washed up on a beach? Maybe a bonus find for someone sometime.
Rather than replacing the cache, with the risk of losing it again, I've decided to archive it. For those wanting to complete the series and needing the clue it is: D=0