When it hits
No set day. It isn't on the calendar: it comes when Wave 1 - Day 1 starts it.
Starts with Wave 1 - Day 1, ends with 
They Scattered.
The same on every run: Student, Warehouse Manager
What comes
1 wave, 33 zombies in all.
| Wave | When | Zombies | Which | Total HP (Standard) |
|---|---|---|---|---|
| Wave 1 | with the crisis | 33 | Office Worker Zombie×7Barefoot Zombie×5Worker Zombie×4Nurse Zombie×4Soldier Zombie×3Crawler Zombie×3Neighbor Zombie×3Hulk Zombie×2Armored Crawler Zombie×2 | 10,025 |
From the game files6
Crisis 213
| id | 213 |
|---|---|
| CrisisID | 213 |
| StartEvent | [40471] |
| EndEvent | [40474] |
| ForecastEvent | [40470] |
| Des | Crisis_Des_213 |
| Des_Local | 协防尸潮 |
| CrisisShowType | 1 |
| CrisisShowPara | [8,9] |
| CrisisFmod | ["event:/Model/Zombie/zombie_zamen10","event:/Model/Zombie/zombie_zamen11","event:/Model/Zombie/zombie_zamen12","event:/Model/Zombie/zombie_zamen14","event:/Model/Zombie/weijizamen05"] |
| CrisisFmodTime | [11.9,8.1,12,10.2,11.2] |
| CrisisFmodGapMin | 1.5 |
| CrisisFmodGapMax | 4 |
