All Security Drone (yellow ball) locations in Destiny 2

The mysterious yellow Security Drones have been making Destiny 2 players scratch their heads since the beginning of Season of the Seraph. Though these cryptic yellow balls were immune to all damage, the release of the Revision Zero Exotic pulse rifle gave fans an answer to the purpose of the devices—but also raised far more questions than it answered.

Where to find all Security Drones (yellow balls) on Europa in Destiny 2

These Security Drones are listed in no particular order.

Beyond, floating on a pillar by the Ziggurat in Europa.
Asterion Abyss, on a small cave on the far side of the area. This yellow orb is located near a region chest and close to the passage toward Eventide Ruins.
Asterion Abyss, on an icy ledge near a Vex structure close to the Concealed Void Lost Sector. Sometimes, a Goblin will be right by the floating yellow ball, which may help lead to its location.
Concealed Void (Asterion Abyss Lost Sector), after the area with the first Heavy Shank. Once the barrier goes down, follow the path and look for a yellow ball to your right as you walk on the catwalk above the Vex Milk, before having to jump from platform to platform.
Cadmus Ridge, above an icicle by a large Vex structure close to the Perdition Lost Sector. This one is visible heading into Cadmus Ridge from Charon’s Crossing, depending on your graphics settings. Just look for a floating yellow ball on top of an icicle.
Cadmus Ridge, to the left of the entrance to Bray Exoscience. This Security Drone is below a regional chest.
Perdition (Cadmus Ridge Lost Sector), in the boss room and to the right of the chest. This was one of the first yellow ball players spotted due to how conspicuous it is.
Bunker E15 (Eventide Ruins Lost Sector): On a hidden room in the area with the energy cages before the boss. Look for an entrance on the far side of where you enter, just past one of the energy cages, to find this yellow ball in the secret room.
Eventide Ruins, on a catwalk on the left of the entrance to the Bunker E15 Lost Sector, before you jump through the ruined facility. If you enter through the side entrance (the one farther from the Eventide landing zone), you can spot this yellow ball from across the room.
Eventide Ruins, by the entrance to the Deep Stone Crypt raid. Look for the two Captains that spawn, then find this Security Drone close to a locked hatch.

Where to find all Security Drones (yellow balls) on the Moon in Destiny 2

These Security Drones are listed in no particular order.

Anchor of Light, on top of the building on the west part of the area. From the entrance to Anchor of Light, make a left, then take a right once you’re past a Toland patrol (marked by a talking ball of light). Climb all the way to the top. A Moon Rabbit is also in this location.
Anchor of Light, just before the entrance to Traitor’s Ketch. Load into the area, then make a right when you can to find this Security Drone.
The Hellmouth, floating near a fallen Hive Tombship. You can spot this one almost as soon as you enter the Hellmouth from Archer’s Line, depending on your in-game settings.
The Hellmouth, on top of a searchlight near the entrance to the K1 Crew Quarters Lost Sector.
K1 Crew Quarters (Hellmouth Lost Sector), just after the gap you have to jump past if you want to get to the Lost Sector boss.
Sorrow’s Harbor, near the ramp to the Scarlet Keep. Find the ramp leading to the Scarlet Keep, then look to your right to spot a floating yellow ball in the distance.
Sorrow’s Harbor, in the entrance to the Scarlet Keep. Head inside, then look on the far end of the room to find this Security Drone floating around.
K1 Revelation (Sorrow’s Harbor Lost Sector), on the left of the ledge where a Shrieker spawns. Look around for a yellow ball before jumping into the area with the crystals in this Lost Sector.
Archer’s Line, on top of the gargantuan walkway-like structure you can spot to the right of where you enter. Climb on the structure, then follow it until the end to find a yellow ball on the other side of the platform.
K1 Logistics (Archer’s Line Lost Sector), above a small building on the right side of the boss arena. Just look for a yellow ball floating on top of a small house. This is also where you can get the free Moon emblem.

Where to find all Security Drones (yellow balls) in Heist Battlegrounds: Europa in Destiny 2

Jump down from where you start, then look behind you to find a yellow ball on the catwalk where the first Acolyte spawns. You can also spot this yellow ball from the Hive Trap near an icicle, to the right of the first Knight.
As soon as you set foot in the Bray Exoscience lobby, look above and to your left to see the top of this Security Drone peeking over a wall.
After clearing the first room in Bray Exoscience, go through the hallway and look behind a stack of boxes instead of making a left. This is before you enter the area with the Wizard and leads into Creation.
In the area with the Hive traps in Creation, stand close to where the Barrier Knight spawns and look to the left of the room to find a yellow ball close to a wall.
In the area with the Deathsong Chorister, jump on the ledge with the Totem (to which the Chorister runs off) and look down and to the left to find this Security Drone on a ledge.
Once you reach the area with the Clovis Bray AI, look for this drone hidden behind some boxes on the far right of the room, past the Cryptolith on the right.

Where to find all Security Drones (yellow balls) in Heist Battlegrounds: Moon in Destiny 2

Spawn into Anchor of Light and look to the right to find a yellow ball close to some canisters on top of a hill. You can also look behind you from the area with the combatant for this one.
Slide down into the Seraph Bunker, then once you touch the ground, turn around to find a yellow ball on the right side of the tunnel you just came in from. You can also shoot it while sliding, if you’re feeling daring.
After entering the area with the first Fallen mines, make a right and look for this Security Drone in a small alcove on the left.
In the area with the Scorn Chieftain, before jumping into the area where you need Ghost’s help to hack a terminal. Instead of going straight to the end of the room and following the hallway, jump to your right to find this drone near a wall.
In the area where you need to defend Ghost while he hacks the terminal, cross the door and look above you to find a yellow ball floating around. This Security Drone can be hard to see if you’re in combat, but hard to miss if you know you have to look for it.
After you reach the area that requires the PDT Refraction Cores, look to the right side of the room, then find this drone on a wall on the left.

Where to find all Security Drones (yellow balls) in Heist Battlegrounds: Mars in Destiny 2

By the area where the Deathsong Chorister spawns on Point A, just past the Totem.
Before entering Point C, take a left on a nearby road and find this Security Drone hidden behind a small wall.
Inside Bray Futurescape, by the ceiling. Jump on the walkways above the entrance and look up if you’re having trouble spotting this yellow ball.
Once you’re past the first batch of security towers, don’t climb the infested wall. Instead, go across the room and down the stairs to find this Security Drone.
After climbing the infested wall and jumping past the gap, look at the ceiling above the Hive trap to find this drone.
After unlocking the door that leads to the final bunker, where you must get the PDT Refraction Cores. Put your back to the door and look high and to the left, near a column on the roof. If you got pulled or missed this one, it should be possible to cross the door and look for it on the left side.

Where to find all Security Drones (yellow balls) Operation: Seraph’s Shield in Destiny 2

Some of these Security Drones aren’t accessible through normal means if you don’t have the Security Clearance upgrade since they’re locked behind doors, though out-of-bounds techniques can do the trick. You’ll also need some subterfuge to bypass some of the traps.

To fly through the lasers guarding some of these drones, you can use a sword’s normal or heavy attack, as well as a Blink, a well-timed Icarus Dash, Titan melee abilities, Thruster, and even Thundercrash. The trick seems to be the timing, hitting the button just as your guardian is about to hit the laser. The Tactical Armor Exo Frame upgrade may also make it easier to soak up the damage from the lasers.

Before entering the Seraph Bunker, make a right until you’re at the end of the platform. Jump down, then quickly turn around to find an opening nested on the platform. The drone should be inside a locked area. Requires the Security Clearance upgrade. You can backtrack by jumping into a foothold on the ice-covered rock across from you.
After getting off the space elevator and picking up Scanner for the second time. To progress the mission, you’ll have to head inside the vents and come into a room where you have to hack a terminal. This drone is behind a doorway protected by lasers. Icarus Dash/Blink/Seismic Strike/Eager Edge past the laser, then look up at the ceiling to find a yellow ball waiting for you.
After you deposit the Scanner augment in a room with a Servitor (the Engineering Sector), you’ll come out into another room that requires you to use the Scanner augment. This drone will be behind a locked door to the right of the room. Requires the Security Clearance upgrade.
In the room leading to the burning puzzle just after the climbing room with several turrets, look to the right as soon as you walk in to spot a yellow ball below the catwalk with the stairs.
After the burning puzzle, head through the doorway and look for a locked door on the right side of the room. This is the first room just after the puzzle, the one where you get Operator. Shooting this yellow ball requires the Security Clearance upgrade.
In the Shrieker room after you receive the Operator buff, you’ll come up on a doorway protected by lasers on the other side of the room, behind the Shriekers. Skip past the lasers to find this drone.
In a room with three turrets, where you get the Warsat Nexus Control Keycard. Look for a blocked vent on the right side of the area. This yellow ball requires the Security Clearance upgrade.
On the first boss area, look for a locked door on the back left of the room, just to the left of the rally banner. Requires the Security Clearance upgrade.
At the hangar at the end of the spacewalk section, look for a doorway protected by lasers on the left side. You can spot this yellow ball from outside, but there’s a glass panel blocking your fire. You’ll have to jump past the lasers to shoot this one.
In the first room after getting the Suppressor augment, behind a locked door to the left. You can see this one through the glass pane nearby. Requires the Security Clearance upgrade.
In the room where you inject the virus at the end of the mission, protected by a laser grid on the left side.
In the room where you inject the virus at the end of the mission, behind a locked door to the right. This doorway is just opposite the laser room with the previous Security Drone, but it requires the Security Clearance upgrade to open.