# Mercer Spheres

> Canonical source: [Mercer Spheres](https://satisfactorybase.com/wiki/collectibles/mercer-spheres)
> Language: en

298 Mercer Spheres on the map. 97 go into the MAM (Dimensional Depot and its upgrades), the rest build Dimensional Depot Uploaders.


:icon[Desc_WAT2_C|32] The **[Mercer Sphere](/wiki/items/mercer-sphere)** (`Desc_WAT2_C`) is a purple alien artefact that usually hangs on rock walls or under overhangs. **298** exist on the map (Patch 1.0). Stack size 50; cannot be sunk; **not renewable**.

## What they are for

All uses belong to the **Dimensional Depot** – the cloud storage whose contents every player can use directly when building and crafting.

| MAM research (Alien Technology) | Mercer Spheres | SAM Fluctuator |
|---|---|---|
| Mercer Sphere Analysis | 1 | – |
| Dimensional Depot | 1 | 11 |
| Manual Depot Uploader | 3 | 29 (+ 17 Computer) |
| Depot Expansion 200 / 300 / 400 / 500 % | 3 / 7 / 13 / 23 | 47 / 103 / 151 / 199 |
| Upload Upgrade 30 / 60 / 120 / 240 per min | 3 / 7 / 13 / 23 | 47 / 103 / 151 / 199 |
| **Total for all research** | **97** | |

The remaining **201** spheres each build one **Dimensional Depot Uploader** (1 Mercer Sphere, 10 SAM Fluctuator, 10 Modular Frame, 100 Wire; 1 belt input; 5 × 10 × 4.25 m; stackable).

| Depot level | Upload rate (items/min) | Stacks per item |
|---|---|---|
| Base | 15 | 1 |
| Level 1 | 30 | 2 (200 %) |
| Level 2 | 60 | 3 (300 %) |
| Level 3 | 120 | 4 (400 %) |
| Level 4 | 240 | 5 (500 %) |

Capacity is a quota per item type (not slots): base 1 stack, e.g. 100 Iron Plate … 500 Screws. An Uploader stops when the quota is full, so the belt backs up – plan an overflow via Smart Splitter to the [AWESOME Sink](/guides/awesome-sink). No fluids. Details: [Somersloop & Mercer Sphere how-to](/guides/somersloop-mercer#mercer-sphere-dimensional-depot).

## Finding them

- Scanner mode via MAM Alien Technology – *Mercer Sphere Analysis* (consumes 1 sphere). Like Somersloops they pulse and trigger ADA messages when you are close.
- Every Mercer Sphere of the world data is drawn on the [map](/map) (*Collectibles → Mercer Sphere*).


- [Somersloop & Mercer Sphere how-to](/guides/somersloop-mercer)

- [Mercer Sphere item](/wiki/items/mercer-sphere)

- [Somersloops](/wiki/collectibles/somersloops)

- [Show Mercer Spheres on the map](/map)