http://rapidshare.com/files/22769887...epths.zip.html
or
http://senduit.com/508f11
or
http://www.megaupload.com/?d=TWPF9NBF
After numerous complaints (including mine) and some research, I decided that the crush depth modelling in stock SHIV is inadequate.
As a result, I've increased crush depths for all submarines by 1/3 to 1/2. All submarines should now be capable of reaching close to twice their test depth before being crushed. Whereas previously attempting to sustain 1.5 times the test depth was fatal, it is now safely possible.
Test Depths:
S Class - 200ft
Porpoise/Salmon/Sargo/Tambor/Gar - 250ft
Gato - 300ft
Balao - 400ft
You can judge the diving depth from there. Additionally, it will be hard to abuse this at the moment because the gauge only goes to 450 and, as you know, the 'maintain depth' button does not work :p
Keep in mind that this was also the case with SHIII where the stock game greatly undermodeled the crush depths. Advanced mods such as GWX and NYGM placed the crush depths at approximately 2.5 times the test depth for the U-boats. Also, when you are damaged, the maximum depth will drastically decrease.