Gargantua is a spinning "Kerr" blackhole in the movie. The nearly maximally spinning blackhole is central to the movie plot as it is the reason Miller's planet

Gargantua is a spinning "Kerr" blackhole in the movie. The nearly maximally spinning blackhole is central to the movie plot as it is the reason Miller's planet can be in the orbit it is claimed to be, tidally locked to the spin direction of the blackhole. And the "accretion disc" is not really accreting into the blackhole but is just in orbit around the blackhole, cooling off. The accretion discs and the polar ejections we know from astronomy are energetic medusas that'll fry anything that so much as glances in its direction.