User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-5174994-20140831233654/@comment-5019018-20140901001556

Connor had to rebuild them because they were broken. I didn't think an explanation was necessary. "Haytham did it" was enough for me. If there was more to it, it should have been touched upon more in AC3.