[TEC] Crew Below and Diesel cut-off depth - hard-coded or tweakable?

[panthercules]

Does anybody know whether the depth at which your crew leaves the bridge and/or the diesels cut off as you dive is hard coded or is something that can be tweaked? If the latter, can someone post what parameter(s) you need to tweak to change this depth? If possible, I need to lower this depth just a little - probably 5-10 feet - but I haven't been able to find anything that will do this yet and it's hanging me up trying to solve one more (and hopefully last) problem before I can release my Pitch mod.

Any clues?