A Terminator, or T-Unit, is a type of Hunter-Killer designed to terminate other lifeforms. Various Terminators are built by an artificially intelligent computer called Skynet in order to wipe out the remains of the human race after Judgment Day. A Terminator with a female outer sheath is referred to as a Terminatrix. Despite Kyle Reese's claim that "cyborgs do not feel pain", a Terminator is capable of sensing injuries and that "the data could be called [pain]". Cameron was revealed to have an intolerance to some degrees of temperature in her surroundings, as humans do. Unlike humans, however, being machines, they are capable of resisting or shutting off this sense of discomfort. It is elaborated that Terminators can appreciate physical sensations such as the wind blowing through its hair and toes, and process them in a psychological manner. Most Terminators were made of dense alloy with an armor coating, making them more durable even than most HKs. Most bullets could do little damage to their chassis. Terminator Cameron states that Terminators' densities deny them the ability to swim. However, that they can survive submerged and walk along the bed to the shore. T-H Infiltrator Prototype is able to swim possibly due to human nature he/she possesses.