The humans were taken back to the ship the humans brought immediately, but even their chamber had some sort of hole that was causing the oxygen in there to leak. Thanks to their subdermal oxygen concentrating implants, they did not have much trouble keeping their breaths. The rest however was not such a happy scenario.
Whatever in the Zimerian atmosphere they encountered it was proving to be toxic for the humans. Even away from it, it still caused various amounts of rashes and with multiple blisters on their skin. It didn't help that there was no medical expert (one that has knowledge of humans) to help them through this condition. All they could do is wait it out till they heal naturally (given they will).