Nuke Callouts: Every CS2 Position Explained, Upper and Lower Floors
Nuke callouts split into two floors. A site sits upstairs, with Hut, Heaven, Mustang, Squeaky and Main around it. B site sits directly below, with Rafters above it, reached through Ramp, Secret, Vents and the Tunnels. Outside, Silo and Garage connect them on the surface. Learn the floor first, then the name, and calls stop sounding like guesswork.
Written by keen, PURE player.
Why Nuke callouts confuse new players
Most maps spread their bombsites side by side. Nuke stacks them. A is on the upper floor of the reactor building, and B is almost straight underneath it, so a player standing on A can be a few metres from someone on B and still be a long rotation away.
That's where the "upper and lower" confusion comes from. When a teammate says "two lower", they mean two players heading for B through Ramp, Secret or Vents. "Upper" is A. Get that one rule into your head and half the map makes sense.
The callouts themselves have barely changed since CS:GO. The names you hear in older pro demos still work in CS2.
Nuke callouts table
| Callout | Floor / area | Where it is and how it's used |
|---|---|---|
| T Spawn | Outside | Where the Terrorists start. |
| CT Spawn | Outside | Where the Counter-Terrorists start, close to Garage. |
| CT Box | Outside | The box near CT Spawn, by the stairs from CT Spawn toward Garage. Overlooks Outside. |
| Outside | Outside | The open yard between Silo, Garage, Secret and A Main. |
| Silo | Outside | The large silo reached from T Roof. Looks over Outside. |
| T Roof | Outside | The roof above Lobby, reached by a ladder near T Spawn. Leads to Silo. |
| T Red | Outside | Red container on the Silo side of Outside. |
| CT Red | Outside | Red container on the Garage side of Outside. |
| Garage | Outside | Big warehouse near CT Spawn, next to Secret. A classic CT AWP spot watching Silo. |
| Secret | Outside to lower | The stairs from Outside down into the Tunnels at B. |
| Main | Upper | The room connecting A site to Outside. |
| Lobby | Upper | The first room from T Spawn. Opens to Sandbags, Squeaky and Radio. |
| Sandbags | Upper | The sandbags between Lobby and Hut. |
| Squeaky | Upper | Off Lobby, with the noisy door onto A site. |
| Hut | Upper | Metal hut on A connecting Lobby to the site. CTs often molly it to slow rushes. |
| Tetris | Upper | The boxes in front of Hut. |
| A Site | Upper | The upper bombsite. |
| Mustang | Upper | Raised area above the Hut exit. |
| Rafters | Lower, B site | Raised area above B site, at the top left of B. |
| Bridge | Upper | Walkway on the upper level. |
| Heaven | Upper | Raised spot over A site, reached by the ladder from Hell. |
| Hell | Upper (CT side) | The area under Heaven, next to Turn Pike and Lockers. Where CTs enter the building from Outside and CT Spawn. |
| Lockers | Upper (CT side) | Locker room with a window onto Garage and CT Red. |
| Vent | Upper to lower | The vent system linking A site, Secret and B site. |
| Radio | Upper (T route to Ramp) | Room between Lobby and Trophy. Has vending machines in CS2. |
| Trophy | Upper (T route to Ramp) | Room with trophies, between Radio and Control. |
| Control | Upper (T route to Ramp) | Leads from Trophy onto Ramp. |
| Ramp | Upper (Ramp room, leads down to B) | The ramp down to B and the room around it. |
| Boost | Upper (Ramp room, leads down to B) | Boxes next to the Control entrance to Ramp. |
| Big Box | Upper (Ramp room, leads down to B) | The big box above the ramp that leads to B. |
| Stack | Upper (Ramp room, leads down to B) | Boxes in the Turn Pike corner of Ramp. |
| Headshot | Upper (Ramp room, leads down to B) | Box at the back of Ramp. A common CT AWP spot. |
| Turn Pike | Lower (corridor under Heaven to B) | Room between Ramp and Hell. |
| Bottom Ramp | Lower | The lower part of Ramp. |
| B Site | Lower | The lower bombsite. |
| Dark | Lower | The dim corner by the stairs on B. |
| Doors | Lower | The double doors from Tunnels and Window onto B. |
| Window | Lower | Room with a breakable window looking onto B. |
| Decon | Lower | Room with the single door from Back Vents and Tunnels onto B. |
| Back Vents | Lower | Area between Decon and Tunnels where Vents comes out. |
| Tunnels | Lower | The connecting tunnels at B not covered by Secret, Back Vents or Window. |
Which callouts matter most in a real round?
You don't need all 41 on day one. In actual comms, maybe a dozen carry most rounds: Outside, Secret, Garage, Silo, Lobby, Squeaky, Hut, Heaven, Hell, Ramp, Vent and Decon.
Calls get short. Nobody says "one player is in the lobby area near the squeaky door". It's "one Squeaky, one Lobby, Ramp's empty". The fewer syllables, the faster the information lands, and on Nuke that matters because rotations between floors are long and every second of warning helps.
Vent is the one that catches newer players out. Somebody dropping through Vent from A to B can turn a lost upper fight into a lower retake in seconds, so it's worth calling every time you hear it.
How pro teams use these calls
Nuke has a reputation as one of the most CT-sided maps in the pool, mostly because both sites have narrow entries and CTs can rotate between floors faster than Terrorists can walk around Outside.
Over the last three months on HLTV, PURE have played Nuke 5 times, winning 2 (40%), as of 16.10.2026. Source: HLTV PURE team page. Five maps is a small sample.
Most organised teams treat Outside and Ramp as the information that decides rotations, so early calls there are worth more than kills.
Common mistakes with Nuke calls
Calling "A" or "B" when you mean a floor. Say "upper" or "lower" if you aren't sure of the exact spot.
Forgetting Vent and Secret exist. Both are quiet routes between floors and outside, and a missed call there loses rounds.
Mixing up Hell and Heaven. Heaven is the raised spot over A. Hell is underneath it.
FAQ
Is A site on top of B site on Nuke?
Roughly, yes. A is on the upper floor and B sits underneath it, which is why players call "upper" for A and "lower" for B.
What is Secret on Nuke?
Secret is the staircase that runs from Outside down into the Tunnels near B site, near Garage.
Where is Heaven on Nuke?
Heaven is the raised area overlooking A site. You reach it by the ladder in Hell.
Did Nuke callouts change in CS2?
Not in any meaningful way. The layout and names are the same or very close to the CS:GO version.
Is Nuke CT-sided?
It's widely seen as one of the most CT-sided maps in rotation, because of its narrow site entries and the CTs' faster rotations between floors.