The specific term does not refer to a single, established "deep story" or viral creepypasta in mainstream internet lore. Instead, "480" is widely recognized as the technical shorthand for Standard Definition (SD) video resolution (640x480 pixels).
: A narrative where investigators find old media (often low-res digital files) in a lockdown vault, warning that looking through them leads to "termination".
mp4" file, or were you trying to find a you saw online?