Slow Zone, but they may escape by performing an immediate reverse jump to where they arrived from if the Slowness is detected, and navigation systems watch for this and store the information required for a return to the start point during each jump. All ships which find themselves in the Slow Zone are restricted to sub-light speeds if an immediate reverse jump back out is impossible. Faster-than-light communication is impossible into or out of the Slow Zone. As the boundaries of the Zones are unknown and subject to change, accidental entry to the Slow Zone is a major interstellar navigational hazard at the "Bottom" of the Beyond. Starships which operate near the Beyond/Slow Zone border often have an auxiliary Bussard ramjet drive, so that, if they accidentally stray into the Slow Zone (thus disabling any FTL drive), they will at least have a backup (sub-light) drive to push them back "up" to the Beyond. Such ships also tend to include "coldsleep" equipment, as it is likely that any such return will still take many subjective lifetimes for most species. The next outermost layer is the Beyond, within which artificial intelligence, faster-than-light travel, and faster-than-light communication are possible. A few human civilizations exist in the Beyond, all descended from a single ethnic Norwegian group which managed to travel from the Slow Zone to the Beyond (presumably at sub-light speeds) and thence spread using FTL travel. The original settlement of this group is known as Nyjora; other human settlements in the Beyond include Straumli Realm and Sjandra Kei. In the Beyond, FTL travel is accomplished by making many small "jumps" across intervening space, and the efficiency of the drive increases the farther a ship travels from the galactic core. This reflects increases in both drive efficiency and the ship's automation's increased capacity as one moves outward, enabling the computation of longer and longer jumps. The Beyond is not a homogeneous zone—many references are made to, e.g., the "High Beyond" or the "Bottom of the Beyond", depending on distance to the galactic core. These terms seem to refer to differences in the Zone itself, not just relative distance from the Core, but there are no obvious Zone boundaries within the Beyond the way there are between the Slow Zone and the Beyond, or between the Beyond and the Transcend. Whereas a ship that crosses from the Beyond to the Slow Zone or vice