Ran into another Invincible merchant...
 

3 torpedos....all of my HE rounds and still afloat!!
I hate this glitch...
http://i98.photobucket.com/albums/l2...elliesmaru.jpg
I call It the Achilles Maru!!!

when posting stuff like this you need to include info on what if any mods you are using so we are better informed about the situation to be able to help you.

try out my torpedo mod, it has several versions to choose from but v1 will give you a small increase in power that is just enough to prevent stuff like that without being a noticable increase in power. there is a chart in the read me to show how each version effects sinking rates on ships.

No comment and don't quote me.

well, I have Natural sinking mod...that's the only thing effecting the ships sinking habits that I can think of.
at first I thought it could be that only one compartment was flooded in the fore section so I put HE rounds all along her port and starboard side...any Ideas how to crack this nut?

oh and I've been using your torpedo mod for a while now...I just reloaded it too see.

and sorry for the short post earlier...I hope I didn't disgruntle Robbins too much...

Looks like she is going down to me, might take a while.

Put another torp in her...they are free:D If you were out of torps and exhausted all your cannon shells..I have been there and done that in SH4 and SH3. I just motor on home without the kill. Sucks.

Yet another proposal
 

From what I saw in the screenshot, the deck gun rounds all hit above the waterline of the target. With natural sinking mechanics, the deck gun is only useful if it hits at or below the waterline.
My idea would be to turn your boat to head directly for the ship's bow on a parallel course, go to flank speed, "run aground" on the ship and then crash dive. If the physics engine is good, it will force the target below the water and eventually sink it. It is reported to have worked in SH3, but I give no warranty for this one. Damage to your sub is normally minuscule.

well, your half right...I had already put 2 torpedoes into her and about 30 below the water line....so I decided to try the upper deck just to be sure...

yea warhawk...I'll use my back tubes...who needs em!!

well thats it then, its the NSM mod, it makes ships sink only from flooding so it may sink if you wait a day or two lol. any shot above the waterline with NSM is wasted, you can blow the decks off the ship but it will never sink because it is not flooding unless you shoot below waterline and into more than one compartment of the ship.

thats why i never use NSM because i dont care if it is realistic to take 12 hours or 2 days to sink, i dont want to wait that long to get credit for my kill

yep pretty much....

the only odd thing is when I loaded the save the ship was gone and it said it was sunk...hmmm

then that is what happened, you did enough damage to already sink it but NSM was making it die very very slowly from flooding

Thats what I said :know:

These young folks and their instant gratification... :D

yeah...I just wasn't used to that slow of a sinking from a merchant...I have seen it in BB's and Carriers....but not that

well, hopefully next time I'll be prepared...