Not sure if this is still relevant (seeing all the new betas and changes) but the Sargo has problems in the last "official" version of this mod, the attack periscope is lower than the observation periscope and when going to periscope depth one can't see anything through the AP, only the OP. As a makeshift solution I edited the periscope depth in the Sargo.cfg file but you still might want to fix it.
great mod, btw
