SCP-1499 is a Soviet GP-5 gas mask. A seal test performed on the object suggests that the object retains its original functionality. The anomalous effects of SCP-1499 activate when a human places SCP-1499 on their head. Approximately one second after SCP-1499 is fully secured on the subject's head, the subject vanishes from view, and is no longer detectable. The subject reports no feeling of motion at this time. Testing has revealed that two-way radios remain capable of both receiving and transmitting, despite the subject being undetectable. Upon wearing SCP-1499, test subjects report completely different surroundings than they were in prior to wearing SCP-1499. Subjects have reported that it appears barren and inhospitable, with tall black towers filling the area. Subjects have also sighted entities in this landscape.