 The authors later retracted their claim, after finding that the clock of one of the seismic stations had a large error during the relevant period.It has been suggested that the International Monitoring System being set up to verify the Comprehensive Nuclear Test Ban Treaty (CTBT) after entry into force may be useful as a sort of "strangelet observatory" using the entire Earth as its detector.The IMS will be designed to detect anomalous seismic disturbances down to energy release or less, and could be able to track strangelets passing through Earth in real time if properly exploited.