Alberich was an anti-asdic coating introduced late in the war, suffered from technical problems (like flaking off), and only two U-boats ever actually took it into a war patrol (so far as I can recall).
In the basic SH3 game, Alberich is offered far too early, and was never more than an experiment anyway.
So NYGM disabled it by the simplest means - dating it to after the end of the war.
Stiebler.
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