| Operation | Story |
| SV-4 Ocean |
Under Tides: Deserted Salviento Previous SV-3 Next SV-5
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| She dares not shed her blood upon this land, for she knows what her blood attracts... But when she is out by the sea, she will attract more than just murderers. <Emergency Aid Building> Once activated, continually treats surrounding units affected by Nervous Impairment. | |
| Recommended level | Elite 1 Level 30 | ||
|---|---|---|---|
| Sanity | Drill Plan | EXP | LMD |
| 12 | 1 | 120 (144) | 120 (144) |
| Unit Limit | Initial DP | Life Points | Enemies |
| 8 | 10 | 3 | 58 |
| Static devices | Emergency Aid Building ×1 | ||
| First clear | Regular |
|---|---|
3 Stars  3 Stars  50 | Guaranteed 12 Common  Common  |
| Normal | Automatic Maintenance Drone ×1, Deep Sea Slider ×46, Floating Sea Drifter ×11 |
|---|
| Recommended level | Elite 1 Level 30 | ||
|---|---|---|---|
| Sanity | Drill Plan | EXP | LMD |
| 12 | 1 | 120 (144) | 120 (144) |
| Unit Limit | Initial DP | Life Points | Enemies |
| 8 | 10 | 3 | 58 |
| Static devices | Emergency Aid Building ×1 | ||
| First clear | Regular |
|---|---|
3 Stars | Guaranteed  |
| Extra | |
       | |
| Normal | Automatic Maintenance Drone ×1, Deep Sea Slider ×46, Floating Sea Drifter ×11 |
|---|