From the newsgroup: drowning on the Plane of Water gave cause of
death as "drowned in a moat". There was already some post-3.4.3 code to
handle naming of moat on Juiblex level as "swamp", but it wasn't used for
drowning's cause of death and we were still getting "drowned in a moat"
there too. Now the Plane of Water yields "drowned in deep water" and
Juiblex's level yields "drowned in a swamp".
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