Destroyers sink themselves with depth charges on occasion, if not sunk, will show damage animation (exploding components) and continue on. I don't have a screenshot, but I have directly observed a destroyer being sunk by its own depth charges via external cam.
*At least one other thread about this:
http://www.subsim.com/radioroom/showthread.php?t=115911
"estimate range to target" in sonar tab only returns the current range entered into the TDC. if an obviously incorrect range is entered into the TDC via the stadimeter, sonar will still return that range. When actually sitting at the sonar station, the active sonar works correctly.
*No other known threads (off the top of my head), but just load and test it, its easy enough to see!
Numerous slow / stupid ships. I saw an entire convoy moving at one seventh of a knot, and saw an entire convoy (including escorts) stop dead after I sunk one of their ships.
*Tons of threads on this subject. including a mod fix @:
http://www.subsim.com/radioroom/showthread.php?t=115525
I should mention that I still saw this happening after the mod was installed, though.
Sorry if anyone mentioned these.
I don't think I saw them in the bug list.