How blow main ballast tanks ??
 

I was playing a single mission and two swordfish bombed my boat , finally it sunk, but i don´t find any blow ballast tanks option.

The boat crushed at 400 or more meters :dead:

no mods, only UI boat 4.14 installed and IDMNID 1.0

Shift+R is Blow Ballast

Hit F1 for the new keybind menu. It is completely different from SHIII and SH 4

Also, one of the buttons on your 'depth' bar (where you can choose periscope depth, dive ect) has a button for "emergency surface" or the same as "blow ballast".
This is the bar on the Bottom/Left of your screen. Hope this helps...
Good Hunting

Ok thanks !!