I was just wondering after I've had the game for a good 4 days that I still can not use a blockade of submarines. How do I go about using this. No matter how many fleets of subs I have, it will not let me use the option for blockade.

I too have played the game for just a few days...I'm pretty sure all the subs you want to use for a blockade need to be "unassigned" & at the shipyard of one of your ports. Try breaking up one of the sub fleets & then trying blockade.

Question...blockades are ment to disrupt trade routes, or transports. If subs ordered for a blockade comes accross a fleet with BB's & CA's or CL's...will the subs attack? Let me know if you find out.

Yeah you need some unassigned subs in your shipyard. Then just go to the region you want to blockade, and the blockade option is in the same menu as the spying option.