YSS Nebula , YX-C1-0014, is a Tansaku-class Science Vessel built at the Ketsurui Fleet Yards on Yamatai (Planet) in YE 31 for the Scientific Studies Service (SSS). It was upgraded to the 1B version in YE 33

The Nebula was dispatched to explore the Nocturne Gate in YE 32. In YE 33 the Nebula returned to its task of mapping the Nocturne Gate.

• YE 35 explored SX-10 as part of the SSS Bisen Lighthouse Deployment.
• YE 35 explored SX-11 as part of the SSS Bisen Lighthouse Deployment.
• YE 35 explored SX-12 as part of the SSS Bisen Lighthouse Deployment.
• YE 35 explored SX-13 as part of the SSS Bisen Lighthouse Deployment.