The Scree-class was a type of Culture Limited Contact Unit active by c. 19th century CE.[1]

Screes were very small; they were the least expensive type of Contact Unit to build.[2] They were only 80 metres long; types of ancient Culture missiles were larger than them.[3] Screes were nearly unarmed.[4]

The class only had a crew of five. This was regarded as far too small to maintain a healthy psychological state in the Mind.[2]

The custom-designed Type 5 Offensive Unit built by the GSV Sleeper Service in the decades prior to the encounter with the Excession near Esperi were based on a militarized Scree.[5]


  1. Excession, chapter 11.8
  2. 2.0 2.1 Hydrogen Sonata, chapter 16
  3. Hydrogen Sonata, chapter 5
  4. Hydrogen Sonata, chapter 21
  5. Excession, chapter 11.13

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