H.E.V Mark VI is a hazardous environment vehicle/ sentient living suit that you can go in and manual control or it can control itself. You walk into a new area in the basement of a abandoned facility and the H.E.V follows you as its atmospheric containment sensors activate, it detects that the current air quality is radioactive. Its chest and belly panels open up and you can see its glowing gooey insides H.E.V: "I advise you to get inside me as the current atmosphere is dangerous"