COVID-19 poses challenges in places of detention, given the specific vulnerabilities of detainees and difficulty of containing outbreaks in such settings. The ICRC's approach to COVID-19 in detention is anchored in support to the authorities who are primarily and ultimately responsible for the wellbeing of detainees and staff. In the context of a public health crisis, it is crucial to ensure good communication with detainees, staff and visitors on the scale of the pandemic and the measures taken to prevent its spread. The ICRC has produced three sensitization and training videos for use by detaining authorities and for all in the wider public who may be affected by detention, such as families of detainees. Using an existing virtual prison environment, the recommended response of a fictional detaining authority is portrayed.