 SCP-605 is a large, amorphous and airborne gaseous entity, visually similar to a high-altitude cloud formation, approximately 180 to 260 meters in diameter. Its exact appearance varies drastically, from being nearly invisible during its dormant phase to resembling an enormous storm front while active. It has been observed to move slowly, but has not left the region bounded by the U.S. state of Florida, Puerto Rico, and Bermuda Island. While active, SCP-605 exhibits behavior similar to that of a living predatory organism and will track ships and aircraft in its territory and attempt to engulf them in its body. The active state of SCP-605 also causes anomalous disruptions of the local magnetic field, causing compasses in other navigation systems to malfunction or report erroneous readings.