Jack 1.4
As he checks this world's biases, it seems as if everything is well within do-ability range. Nothing seems particularly easy or difficult.
If he checks with the Sphere-body's sensors, he is able to obtain a full map of the region, including the entire cave system he is in, as well as the surrounding area. This particular cave system has only one open exit to the surface which is at the top of a very long cleft in the stone that extends to the top of a mountain above. It would be very difficult but not impossible to climb out, and he would exit on top of a plateau which is practically inaccessible without flight or exceptionally skilled sheer cliff climbing abilities to anyone on the surface. The other passable exit is the river below him down a few winding cave passages, which would require being under water for about 1 hour and exits near the bottom of a lake at the base of the mountain. There are a number of other passageways that come within meters of the surface, but are blocked by fallen debris from the mountain. He could get out of them, but they would be inaccessible to anyone without boulder-moving equipment.
There is a settlement nearby on the surface, which is populated by monkey-like humanoids who are about knee-high for Jack.