Because 6 Underground was a Netflix original, it did not have a traditional theatrical window. However, the demand for offline, portable versions of the film was massive. Netflix allows downloads via its official app, but those files expire. This is where Hdhub4u stepped in. The site offered permanent, DRM-free copies of the film, leading to the specific search phrase "hdhub4u 6 Underground."
The film is characterized by Bay's signature style: explosive action sequences, fast-paced editing, and elaborate set pieces. While it received mixed-to-negative reviews from critics regarding its plot and runtime, it was a massive commercial success for Netflix, reportedly watched by millions of households within its first month of release.