I can't remember the details now, but in FotRSU, we based the wrecked BB at Pearl on the Stock game's wrecks, and we made them environmental also. Check what we did with them. The are in the Sea folder as "WRC*", with the asteric being the name of the ship. We used the center setting in the dat file to set the ships' depth, but you can do similar in the mis file afterwards by text editing the Depth= setting by hand. You just can't open the file in the ME afterwards, because it will re-set that figure back to zero... so you might have a levitating vessel, or you might have one beneath the wave...

- CapnScurvy did most of the final editing in the mod as it stands now, but it really isn't quite compete yet, since we have dry-docked versions, some YD cranes and other support vessels to add yet... We built a static S-Boat, and a Fleetboat, but have not added those yet, and I do have to find those. If I remember to look for them when I wake-up in morning, I'll send you a link for a copy of them. We have plans for the grounded subs also. But for now, copy off of FotRSU's wrecks at Pearl. Their Roster cfg files are under the Roster / Environmental / Sea folder.