In 153 and again in 160, expeditions lead by Admiral Inesh Rydel tried to locate a useable jump route across the Great Rift from Corridor Sector (rimward) to Deneb Sector. The first expedition originated from Sinta (Corridor 2037) and eventually arrived by various routes at Ashishinipar (Corridor 0931).
Nearly a year was spent trying to find a way to go further to no avail. A second attempt, made by a different route ended on Ishirdu (Corridor 0338). This proved closer, but not close enough to Yoma (Deneb 3031), the closest possible world in this area of the rift.
See also Riilam Kirshamii