The British scientists found out that the most used letter in English is 'O'. But not in the catacombs. Remember one thing. In the catacombs the most frequent letter that is used is 'A'. Kind of like this: - AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAh! Because in the cAtAcombs it is: A. dArk A. scAry A. dAngerous A. the clues Appear All of A sudden. Ah! One more thing. It's cold there. So you hAve only one hour to find your wAy out before you freeze. Because of the harsh conditions, the members of the teams (2-4 people) for this quest should be at least 14 years old. We strongly recommend this for those teams that have been through other quests before. The survival rate of this quest is about 15%.