# 3F Corridor: Survey research

> 3F Corridor: Survey: Required Materials. Timber, Iron Ore

Canonical: https://lostark.wiki/database/stronghold-research/3f-corridor-survey-109303?relation=research_materials

Survey the visitors to improve the behaviors of butlers.  
The best stronghold deserves the best butlers.

## Facts

- **Category**: Stronghold and Slot Extension
- **Time Taken**: 0d 09:00:00
- **Required Action Energy**: 2,534
- **Research Cost**: 315 Gold
- **Stronghold XP gained**: 5,069
- **Research Requirements**: Lab Lv. 8; Stronghold Lv. 65 or above; [Manor Lv. 8](https://lostark.wiki/database/stronghold-research/manor-lv-8-101008); [3F Corridor: Refresh Program](https://lostark.wiki/database/stronghold-research/3f-corridor-refresh-program-109302)

## Related

- [Research Requirements](https://lostark.wiki/database/stronghold-research/3f-corridor-survey-109303#relationships) (2)
- [Required Materials](https://lostark.wiki/database/stronghold-research/3f-corridor-survey-109303?relation=research_materials#relationships) (2)

### Required Materials

1–2 of 2

| Name | Quantity | Details |
| --- | --- | --- |
| [Timber](https://lostark.wiki/database/items/timber-6882301) | 30 | Quantity 30 |
| [Iron Ore](https://lostark.wiki/database/items/iron-ore-6882401) | 30 | Quantity 30 |

## Related

- [Home](https://lostark.wiki/)
- [Stronghold Research](https://lostark.wiki/database/stronghold-research)