The Plate-class General Systems Vehicle (GSV) Sleeper Service was introduced in the Culture novel Excession by Iain M. Banks. The Sleeper Service features as a reclusive Eccentric which had separated from the Culture proper over 4 decades previously, wandering. Later on, it becomes clear that it had never really left the employ of the Culture's secret services, and investigates the titular Excession, using its 'artificial ecology' as a secret weapon.