These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Fantastic Voyage
Nightmare Fuel: The whole movie has a strange, unnerving, psychedelic feel. The initial scenes in the submarine are also extremely claustrophobic, which explains Michaels's panic attack.
Cora is attacked by antibodies in the inner ear, which causes her to scream bloody murder. She then complains of being strangled and unable to breathe. As if the claustrophobic feel of the movie wasn't enough.
Michaels' death - being digested alive by a phagocyte - is pretty grisly.