The first thing they noticed was the light. Bright, blinding, unbelievable light, coming from above. Sandstone's entire artificial lighting system in the middle of a workday couldn't produce a fraction of the light they were seeing. Then, as the image was processed further and continued to improve, they all saw it. Its crew enthralled by the sight before them, the Edge of the Universe continued to slowly rise, and then stopped.
Outside pressure is so low that it's barely measurable.
The tanks are now filled to capacity with gas. I helped design the shielding system, and believe me, seven kilometers was a conservative estimate. The tanks are completely filled, the ship simply won't go any higher. Raz was deeply frustrated. To come so far and have to turn back was intolerable.