Why? Frigates can't carry units, nor can they enter closed-border waters without declaring war.
Sometimes you want to sneak a spy across the ocean, and maybe your production queues are occupied with other things, and you just happen to have a caravel come home after a long sea voyage. Presto! Upgrado! You've got a sub.
Sometimes you want to sneak a spy across the ocean, and maybe your production queues are occupied with other things, and you just happen to have a caravel come home after a long sea voyage. Presto! Upgrado! You've got a sub.
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