One of the audible alarm sounds used in the Main Control Room and in mission-specific Dedicated Control Rooms, at ESOC, ESA's space operations centre, Darmstadt, Germany.
In a spacecraft's mission control system, this sound can be assigned to any out-of-range event or specific occurrence, to alert the on-duty engineer or spacecraft controller. For example, if an on-board temperature exceeds a certain limit, this alarm can be sounded.
Some missions use slightly different sounds to avoid confusion.
This sound is used by Cluster.
Credit: ESA CC BY-SA IGO 3.0
http://www.esa.int/Services/Creative_Commons_Attribution-ShareAlike_3.0_IGO_CC_BY-SA_3.0_IGO_licence
