Board Thread:Spoilers!/@comment-4453062-20160217065238/@comment-6175354-20160224024020

8Rob wrote:

I guess they have like 24 hours to escape from the UW or Hades will take their souls and they will remain in the UW forever

So, I think the clock tower is there because the deadline expired just when they were about to leave and Hades came to take their souls Of all the fan theories, this sounds like the most plausible.