OMG! How bad is Sunshine? It appears that the computer is cooled by dipping it in vat of coolant. This vat is open and without any kind of railings, even chains. Early on, the tech drops a spanner in it and reaches in without PPE to fetch it almost injuring himself. Why is he not wearing PPE around it? It's a spacecraft FCOL! One suden burst of an attitude control thruster and he could be covered in coolant.

Of all the terrible science/engineering in this movie, this aspect is the worst.