A gate was left unlocked in 1453 during the Ottoman Empire's assault on Constantinople which led to the fall of the city, as the Turks poured in and annihilated the Byzantines.<br>
The speaker discusses a potential oversight in city protection that could have serious consequences. Though not explained in detail, the speaker suggests the potential ramifications are significant, given the large size of the city in question.
The hosts discuss a hilarious hypothetical situation in which an ancient city was betrayed by guards who were too busy taking selfies to pay attention to a gate they were supposed to be defending.