One particularly deep and narrow section of White Canyon is known as the Black Hole. The walls in this permanently flooded 500-foot (150 m) long section are only a few feet (about 1 m) apart in some places.[3]Canyoneers sometimes wear wetsuits to guard against hypothermia while traversing this section.[4] The danger of flash flooding is very high due to the canyon's large drainage basin.[4] A 16-year-old girl drowned in a flash flood while hiking in the Black Hole area in September 1996.[5]