Volkov's death in particular is probably the most disturbing out of all of them. After dying the space station's colony of worms bursts out of him and while dissecting his body they find the station's gyroscope inside him. Why were they inside him in the first place? We ultimately never find out beyond it being a fourth dimensional rupture.
Speaking of Vokov, the sheer amount of Body Horror he goes through (the example displayed in the page image is the least bad thing to happen to him) really makes you feel for the poor guy.
Later there is Mundy's death. He gets swarmed and strangled by nanobots due to an electromagnet being on before dying in an explosion caused by a CO2 canister.
Even after his death Mundy's arm is still shown being sentient and alive.
Tam being Flash Frozen instantly as a result of flooding and water leaking into outer-space.
Mina getting ejected into outer-space, suffering explosive decompression. Thankfully, the viewers don't see it.
On a psychological level, Schmidt finding out that his Alternate Universe counterpart betrayed his friends and crewmembers. The collision of universes caused the counterpart's communication files to overwrite his own, convincing the rest of the crew to turn against him all while he has no idea what's going on. Even after his name is cleared, he still appears unsettled by the whole thing.
