The Codec is more than just a communication tool in Metal Gear Solid Delta: Snake Eater. While you’ll use it often to contact allies like Major Zero, Para-Medic, and Sigint, it also hides a variety of secret frequencies. These frequencies can heal Snake, call in fire support, cancel alerts, or even unlock restricted areas. Knowing them can make your playthrough smoother—and in true Kojima fashion, they add another layer of tactical depth to the game.
Below is a full breakdown of every type of hidden radio frequency, how to unlock them, and what they do across different difficulty levels.
How to Find Secret Frequencies
You won’t start with every code in hand. Instead, Snake must discover them by interrogating enemy soldiers during stealth encounters. Approach silently by using the stalking button (LB/L1), which darkens the screen edges and muffles footsteps. Then grab an enemy with CQC by holding RT/R2 without moving the stick—otherwise, you might throw him by mistake. Once grabbed, select “Interrogate,” and guards may reveal valuable frequency numbers.
See also: Metal Gear Solid Delta PS5 Pro Performance Problem – Should You Play on Base PS5?
To use them, press down on the D-pad to open the Radio Frequency screen, switch to manual input, enter the code, and call. Once you successfully tune into a frequency, MGS Delta automatically records it in your Codec list, so you won’t need to memorize or write them down for later.
Healing Frequencies (Stamina Recovery)
Tuning into specific radio tracks restores Snake’s stamina, which is vital when food is scarce. Each track works only once per playthrough, and the frequency depends on your chosen difficulty.
| Track (Artist) | Easy | Normal | Hard | Extreme |
|---|---|---|---|---|
| Salty Catfish (66 Boys) | 140.01 | 145.83 | 146.07 | 141.42 |
| Surfing Guitar (66 Boys) | 147.08 | 148.39 | 141.59 | 146.45 |
| Rock Me Baby (66 Boys) | 140.52 | 146.65 | 143.83 | 148.66 |
| Pillow Talk (Starry K.) | 142.94 | 148.96 | 144.25 | 140.16 |
| Don’t Be Afraid (Rika Muranaka) | 149.53 | 141.85 | 144.63 | 149.39 |
| Sailor (Starry K.) | 147.59 | 143.32 | 143.97 | 142.42 |
| Jumpin’ Johnny (Chunk Raspberry) | 144.06 | 144.86 | 147.96 | 148.78 |
| Sea Breeze (Sergei Mantis) | 141.42 | 142.09 | 145.72 | 145.18 |
Fire Support Frequencies (Air Strikes)
These frequencies let you call in air support at certain outdoor locations. They vary by difficulty and can only be used if you’ve interrogated a soldier who knows the code. Using one for the first time even rewards you with a trophy.
| Location | Easy | Normal | Hard | Extreme |
|---|---|---|---|---|
| Bolshaya Past South | 140.73 | 141.62 | 147.23 | 146.14 |
| Bolshaya Past Base | – | – | 148.63 | 148.17 |
| Ponizovje West | 145.28 | 142.12 | 140.36 | 143.20 |
| Ponizovje Warehouse: Exterior | 143.89 | 147.32 | 144.19 | 148.98 |
| Ponizovje Warehouse | 144.03 | 148.56 | 144.19 | 140.22 |
| Graniny Gorki Lab Exterior Yard | 143.61 | 146.74 | 142.91 | 147.82 |
| Svyatogornyj West | 144.93 | 141.31 | 149.84 | – |
| Svyatogornyj East | 147.04 | 149.29 | 141.79 | 145.80 |
| Krasnogorje Mountain Base | 143.98 | 145.68 | 149.52 | 141.03 |
| Krasnogorje Mountainside | 144.93 | 147.90 | 149.12 | 146.46 |
| Krasnogorje Mountaintop | 143.56 | 140.09 | 142.29 | 145.99 |
| Zaozyorje East | 149.06 | 146.33 | 148.31 | 146.82 |
Alert Cancel Frequencies (Clear Evasion Phases)
When Snake is detected, you can sometimes use the radio to cancel alert or evasion phases—if you’ve unlocked the right code. These only work if you’re already in Caution or Evasion status.
| Location | Easy | Normal | Hard | Extreme |
|---|---|---|---|---|
| Dolinovodno | – | – | 146.20 | 142.65 |
| Bolshaya Past South | 143.03 | 147.11 | 146.91 | 144.52 |
| Bolshaya Past Base | – | 149.46 | – | – |
| Ponizovje West | – | 140.61 | 145.42 | – |
| Ponizovje Warehouse: Exterior | 149.75 | – | – | – |
| Ponizovje Warehouse | 149.63 | 141.45 | 142.48 | 143.72 |
| Graniny Gorki Lab 1F/2F | 149.90 | – | – | 145.07 |
| Graniny Gorki Lab B1 East | – | – | 144.87 | 145.31 |
| Svyatogornyj West | 148.87 | 142.79 | 145.59 | 144.28 |
| Svyatogornyj East | 146.59 | 148.04 | 142.03 | 147.79 |
| Krasnogorje Mountain Base | – | – | 140.58 | 148.54 |
| Krasnogorje Mountainside | 145.94 | 146.67 | – | – |
| Krasnogorje Mountaintop | 140.15 | 141.98 | 140.58 | 148.26 |
| Groznyj Grad 1F Northeast | – | 141.53 | – | 141.17 |
| Groznyj Grad 1F Southeast | – | 144.40 | 146.08 | – |
| Groznyj Grad 1F Southwest | 143.16 | – | 147.54 | – |
| Groznyj Grad 1F Northwest | 147.49 | – | – | 140.47 |
| Groznyj Grad Weapons Lab East Wing | 143.94 | 144.61 | 147.65 | 144.14 |
Scientist Disguise Frequencies (Unlocking Doors)
In the later stages inside Groznyj Grad, you’ll need specific frequencies to unlock certain doors when disguised as a scientist. These codes vary slightly by difficulty.
| Door | Easy | Normal | Hard | Extreme |
|---|---|---|---|---|
| East Wing 1F Eastern Door | 148.13 | 148.13 | 141.41 | 141.06 |
| East Wing 2F Northern Door | 147.86 | 147.86 | 147.86 | 149.48 |
| East Wing 1F Western Door | 145.86 | 145.86 | 146.95 | 142.81 |
| East Wing 2F Southern Door | 143.45 | 143.45 | 140.30 | 142.57 |
| Prison Cell Door | 144.75 | 144.75 | 144.75 | 144.75 |
The Prison Cell Door frequency is the same across all difficulties, making it a reliable fallback.
Mission Specialist Frequencies
Not all frequencies are hidden. Some are given early in the Virtuous Mission and Operation Snake Eater campaigns. These connect Snake to his support team:
- Major Zero (Major Tom): 140.85
- Para-Medic: 145.73
- Para-Medic (Save): 140.96
- The Boss (Virtuous Mission only): 141.80
- Sigint: 148.80
- EVA: 142.52
Keep these close by. Para-Medic’s save line is essential, and EVA’s frequency becomes especially important later in Operation Snake Eater.
Fix Issues with Radio Frequencies in MGS Delta Snake Eater
If a code doesn’t work, check the following:
- Make sure you’re on the correct difficulty level, as numbers differ by mode.
- Some frequencies require interrogation in the exact area before they can be used.
- Healing tracks and fire support strikes can only be used once per playthrough.
- Alert Cancel frequencies only respond during Caution or Evasion phases.
- Enter numbers carefully—one wrong digit will fail the call.
Pro tip: Save Healing tracks for boss fights or long wilderness stretches, use Alert Cancel inside Groznyj Grad to slip past patrols, and call Fire Support in wide, open areas where enemies outnumber you.
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The secret radio frequencies in MGS Delta: Snake Eater are more than nostalgic callbacks—they’re practical tools that reward exploration and stealth. Whether it’s recovering stamina with soothing tracks, unlocking alternate routes, or turning the enemy’s weapons against them with airstrikes, these codes embody the series’ blend of realism and creativity. Mastering them ensures you’ll always have an extra trick ready when Snake’s mission gets tough. Play Now!
