Usually, unexplained damage come from collisions, or bombs from a NavSearch plane, especially if the ship has low experience. Things can go south very quickly when you only have 5 XP...ORIGINAL: RhinoDad
Sometimes it seems a ship will just sink. I am unable to find it on operations, sigint, combat reports. Only mention will be Ship name and sunk, no how or why. Beginning of turn just fine no damage, in TF in Port going nowhere. During turn still going nowhere a message pops up saying it sunk usually near housecleaning stuff near end of turn. Now I admit I have been know to miss things on occasion but this has happened a bit too many times for me to think that I am always missing it.
Figure hit mine, enemy scout action, some ammo touched off, or something maybe??? No message, no combat shown or reported at port hex but within range of Japanese scouts.
So it seems not everything can be discerned from the reports, but they are useful. You really need to take the time to watch the turn play out as well as listen to the audio clues.
There are enough info appearing during the turn resolution that it pays to give it all your attention. Even more so during combats : there are many messages there that you can’t find in the reports.