Here is just a quick idea I had that I thought would be interesting.

Tracker
Reduces the radar range of all of your outposts by 25%. The trackers sub has a radar range equal to half of your outposts radar. All enemy subs within his radar range get a 50% reduction in speed and while an enemy sub is in the trackers radar his sub gets a 200% increase in speed. When engaging in sub to sub combat he destroys 5 drillers on the enemy sub.
Icon: a radar screen
Quote: A powerful target is weakened by its size

hmmm......all these ideas seem suitable for like 3 different speciliasts