Multiple characters die in different and disturbing ways throughout the film - via implosion, freezing, sentient magnets, and we see a character with wires and electrical tubes trapped in her limbs.
As shown in one of its trailers, one of the men has his arm separated from him after being affected by the alternate dimension they were stuck in. It's not bloody, although some might find that both ends where the arm and the shoulder are supposed to meet disturbing (anatomically correct but with no blood dripping).