On September 17, 2005 Nicolay Beluchenko discovered the first c/6 diagonal spaceship, seal. Beluchenko then discovered a tagalong for this spaceship on September 22, 2005. The first spaceship of this speed to be discovered not based on seal, 77P6H1V1, was discovered in March 2011 by Josh Ball and is currently the smallest known spaceship of this speed.
No c/6 diagonal puffer technology is currently known.
- Jason Summers' jslife pattern collection.