Getting this screen on Cursed expedition

I'm at the very beginning of the Cursed Expedition.

I tunneled underground to get a buried item and fell into a pool, I thrn tunneled.my way up, only to fall into another pool.
I then used my scanner to find a buried cache, so I pointed my terrain manipulator in that direction at an upward angle and kept following it until I got to the cache, after opening the cache, I jumped out of the tunnel I had made and started receiving this screen.

It keeps telling me that my oxygen levels are critical, and on reload it will still give me this screen.

I am unable to progress in the cursed expedition because of this.

Please halp.