I got a notification that a topic I was watching had a reply...but now the whole topic is gone?
Topic Reply Notification - How to make a Hydrophone (stereo!)
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That probably was deleted because the comment was spam. Your original topic is still alive and well at the uniform resource locator http://www.freesound.org/forum/viewtopic.php?t=2631
The "p=19409" in the url you received refers to the post which, because it was spam, is indeed deleted, but the "t=2631" refers to the topic which is still there.