In April 2005, the Directorate of Volcanology and Geological Hazard Mitigation raised an alert, forbidding visitors from going up the volcano.

"Sensors on the slopes of the two mountains - Anak Krakatoa on the southern tip of Sumatra Island and Tangkuban Perahu in Java - picked up an increase in volcanic activity and a build-up of gases, said government volcanologist Syamsul Rizal.

"[3] On the mountain's northern flank is Death Valley, which derives its name from a frequent accumulation of poisonous gases.

[6] On 2 August 2019, the volcano experienced eight minor eruptions, and as a result, the place was closed down for visitors, but is open again.

Dayang Sumbi saw that the tasks were almost completed and called on her workers to spread red silk cloths east of the city, to give the impression of impending sunrise.