The reduced parts of heck lie within the city walls of the dead Dis, bordered by swamps developed by the river Styg. Those who are penalized at Dis are those that deliberately commit criminal offenses. The city wall surfaces are guarded by fallen angels. Virgil was not able to persuade them to let him and also Dante right into the city, as well as the sirens Furies as well as Medusa intimidated Dante. An angel sent out below Heaven ensures them entry right into the city.