I think the dissapearing torpedo line is a bug it happens when you cross the international date line e.g. when you travel west of Midway. There is no fix for this as of yet as far as I know.
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Another strange thing happened, after an attack i set depth to 120 meters, but the hull crushed at only 48 meters...
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Yes this must be due to the aircraft attaks as 48 Meters is only 157.4 Feet (I play in imperial measurements as it is what I am used to living in England). The Gar boats test deapth is about 246 ft which is 75 m.
This screenshot has some usefull info on the other subs too (if you can see it i,ve had to reduce the size

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This is not stock SH4 it comes with an excellent mod by Ducimus called Trigger Maru. You can find it in the mods section of these forums, I highly recommend that you try it out.