Designed for Public Safety Divers The 911 BC was introduced in 1997, in response to many requests from Public Safety divers for a system designed to fit their needs. The 911 has been proven by a large number of public safety agencies around the world to be a durable and flexible platform. Based on the Tech 10 platform with a twin buckle front closure, but with additional features. These include SOLAS standard symbols on buckles, reflective trim on the bladder, additional D-rings, pockets for long octopus hose storage on each bladder wing, and an included split saddle harness.