The SBRV (pronounced "suberver") is an area featured in the Dramatic Mode of Cyber Troopers Virtual-On MARZ.
The SBRV is a Forbidden Zone situated on the Earth. This area divides the 8th Plant "Flesh Refoe" from the rest of the world and is managed by the giant cyber-syndicate TSC. There is a type of V-Crystal located in the area, known as Wild Crystals, which maintain a defensive seal in the area. It is revealed later on in the arc that the defensive seal contained Jaguarandi, and that it prevented the massive phantom VR from materializing into the real world. Along with that, Sgt. Hatter defects from MARZ in search of the truth, right after he returns to assist the player during their second battle against the Rose Sisters.
For details, see List of Cyber Troopers Virtual-On MARZ missions