What was the source of your v1.3 game? If you've got a Steam version, the v1.4 update can not be installed on top of it.
The Uboats are in the v1.5 UBoat Missions Add-on, or Silent Hunter: Wolves of the Pacific Gold Edition. The "stock" version is rather gaunt. You'll most likely want to use Lurker's Operation Monsun for that. All of the major mods' most recent offerings also require v1.5 UBoats...
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"...and bollocks to the naysayer/s" - Jimbuna
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