# Sandbox.WaterBody.UnderwaterParticleTimeOffset

```csharp
double UnderwaterParticleTimeOffset { get; set; }
```

Sediment-clock offset in seconds. Speed edits update it to preserve the current particle positions.
Serialized with the body so copies and saved frozen fields retain their phase.

Declared in [Sandbox.WaterBody](/api/Sandbox.WaterBody).
Assembly: `Sandbox.Engine`.