Misha1967, I saw your post on the OHII thread and I think that is the answer.
In his FX mod, TDW made many custom tweaks to how various ships sink which only work properly with the custom Zones.cfg file that comes with his mod.
I have not looked at OHII enviro, but I presume their Zone.cfg file is only the stock file with their custom tweaks and that it does not include TDW's tweaks.
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