SeaGlass Anomaly Near SeaTac Airport (IMAGE) University of Washington Caption The researchers captured 2000 broadcasts (blue dots) from a cell tower near Sea-Tac airport, which consistently had the same properties. The red dot represents one highly unusual signal - with properties that would be unexpected anywhere in the city - that would be consistent with an IMSI-catcher "pretending" to be that cell tower. Credit University of Washington Usage Restrictions With credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.