Quote Originally Posted by DarkCometII View Post
Prior to 4.4 the highest surveilance stat was U/U/U/U at 115, as to the minimum opinions vary - some will tell you 80, personally I never saw a rare <100. I ran an U/U/S/U at 105 surv up to 4.4, rare drop rate was about 6% less than 115 by my reckoning.

The new highest Surv build is C/U/C/C at 175.
Can also opt for Whale Stern over Unkiu for same surv; it's slow, but it has a bit more range and a little more retrieval. Makes for a great looking submarine to boot!