submerged monsters visible to the player except for them still showing as a disturbance in the water, and prefix the name of submerged monsters with "submerged".
Fix simple_monster_message() to always give the message during arena mode.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8167 c06c8d41-db1a-0410-9941-cceddc491573
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