Jacob didn't stop with only those two space rings; while he was reaching the surface, he opened every locked space ring in his possession and arranged its contents, throwing away the useless stuff in them.
By the time he was done, he could see the light up ahead. It was apparently day on the surface, and seeing the sunlight after so many years excited Jacob for a moment.
However, his excitement didn't last long, as he knew he wasn't out of the woods. The Ice Fiend Locust Queen might send her army the moment she realized that Jacob was reachable again.
Nonetheless, Jacob was ready. The moment he reached the surface, he stored away the thunder whale, took out the flying ship, and set its destination towards Unique Plains.
After all, even if Ice Fiend Locust Queen sent millions of her minions, only the Unique Rank ones would be able to enter the Unique Plains, and then killing them wouldn't be just his problem, would it?