Most recently, there was an incident in a modern cable-borne elevator that took place in a children's hospital in Seattle, Washington on October 9, 2007. The elevator involved was a ThyssenKrupp ISIS machine room-less elevator; The ISIS used Kevlar fiberglass ropes instead of conventional braided-steel ropes all other traction elevators use. One of the ISIS elevators broke free from its cables, slipping between the 6th and 4th floors; the Kevlar ropes were the cause of this incident. After the incident, ThyssenKrupp discontinued production of the ISIS and, the following year, replaced it with the Synergy machine room-less elevator, which uses conventional braided-steel ropes, making it much safer.