Originally posted by DocFrance
The mullet man is talking about FF3j, where you have to take your submarine under a castle in order to get the Odin summon... but I guess there are more than a few similarities here...
hey, I wanted to mention this

and the Master Dragoner is right, go to the empty chest on the left of that door!
By the way, try to steal the protect-ring from Odin if you're able to, its worth it!!