User blog comment:PitchBlack696/Zinogre/@comment-1998751-20110129190934/@comment-3062343-20110130043141

I think the subs in Unite were basically just an excuse to have a greater variety of weapons and armour. They were never stated in-game to be different monsters to their normal counterparts, whereas they are in P3rd (e.g. Subs now have their own icons in P3rd, and they have separate number-slain/captured counters).