Amazing story. Kind of surprising that the Japanese didn't recognize the vulnerability of this part of the shipyard, considering it had been subjected to attack

Amazing story. Kind of surprising that the Japanese didn't recognize the vulnerability of this part of the shipyard, considering it had been subjected to attacks before. It's a massive single point of failure, and it seems like some steps could have been taken to minimize the risk ... for instance, distributing the blueprints and templates in different parts of the facility, or making backups of critical plans.