Deep-diving Depth Gauge - does one exist?

[Deathfrombelow23]

I remember seeing a mod for one of these a long time ago... I think it was for a 400 meter gauge meant to be used with the XXI and VIIC/42 so that commanders could take their boat deeper than the 265 meters the standard gauge allows. I found the link recently and downloaded it but it did not work or even show up in the game... and I tried using JSGME to install it (I'm running GWX 2.0 and no other mods). Does anyone know of another depth guage or a way to get your boat to go deeper than the 265 meters the standard gauge allows (without sinking or flooding, ofcourse!! ) Thanks for your help, friends!